diff --git a/Module7/Gplex.exe b/Module7/Gplex.exe
new file mode 100644
index 0000000000000000000000000000000000000000..51a522e221f5ca52cc934933e08745f1653a98b5
Binary files /dev/null and b/Module7/Gplex.exe differ
diff --git a/Module7/Gppg.exe b/Module7/Gppg.exe
new file mode 100644
index 0000000000000000000000000000000000000000..edca401986741541f14b7d4bd89adc57802327a2
Binary files /dev/null and b/Module7/Gppg.exe differ
diff --git a/Module7/ProgramTree.cs b/Module7/ProgramTree.cs
index e48dcb56fcb811d4b2e7f37bbf71e935306aedc6..1fd81289f22c3d1948399adebfe65fe1fc080319 100644
--- a/Module7/ProgramTree.cs
+++ b/Module7/ProgramTree.cs
@@ -142,4 +142,23 @@ namespace ProgramTree
             v.VisitVarDefNode(this);
         }
     }
+
+    public class IfNode : StatementNode
+    {
+        public ExprNode Expr { get; set; }
+        public StatementNode ThenStat { get; set; }
+        public StatementNode ElseStat { get; set; }
+        public IfNode(ExprNode expr, StatementNode then_stat, StatementNode else_stat = null)
+        {
+            Expr = expr;
+            ThenStat = then_stat;
+            ElseStat = else_stat;
+        }
+
+        public override void Visit(Visitor v)
+        {
+            v.VisitIfNode(this);
+        }
+    }
+
 }
\ No newline at end of file
diff --git a/Module7/SimpleLex.cs b/Module7/SimpleLex.cs
index 98388ef125489f1e1cc850a1341825c4971cf640..cc772d5a971c79603413736f0fcf87f7cbb9a240 100644
--- a/Module7/SimpleLex.cs
+++ b/Module7/SimpleLex.cs
@@ -1,14 +1,10 @@
 //
 //  This CSharp output file generated by Gardens Point LEX
-//  Gardens Point LEX (GPLEX) is Copyright (c) John Gough, QUT 2006-2014.
-//  Output produced by GPLEX is the property of the user.
-//  See accompanying file GPLEXcopyright.rtf.
-//
-//  GPLEX Version:  1.2.2
-//  Machine:  MAINHOMEPC2
-//  DateTime: 30.09.2018 18:17:27
-//  UserName: someone
-//  GPLEX input file <SimpleLex.lex - 24.09.2018 23:47:03>
+//  Version:  1.1.3.301
+//  Machine:  DESKTOP-H0VRSS3
+//  DateTime: 06.11.2022 21:58:12
+//  UserName: nikit
+//  GPLEX input file <SimpleLex.lex>
 //  GPLEX frame file <embedded resource>
 //
 //  Option settings: unicode, parser, minimize
@@ -17,8 +13,8 @@
 //
 
 //
-// Revised backup code
-// Version 1.2.1 of 24-June-2013
+// Experimental embedded frame
+// Version 1.1.3 of 18-April-2010
 //
 //
 #define BACKUP
@@ -305,7 +301,8 @@ int NextState() {
 
         public Scanner(Stream file, string codepage) {
             SetSource(file, CodePageHandling.GetCodePage(codepage));
-        }   
+        }
+        
 #endif // !NOFILES
 
      public Scanner() { }
@@ -333,7 +330,7 @@ int NextState() {
                     if (next < 0xDC00 || next > 0xDFFF)
                         code = ScanBuff.UnicodeReplacementChar;
                     else
-                        code = (0x10000 + ((code & 0x3FF) << 10) + (next & 0x3FF));
+                        code = (0x10000 + (code & 0x3FF << 10) + (next & 0x3FF));
                 }
 #endif
                 cCol++;
@@ -386,7 +383,9 @@ int NextState() {
             GetCode();
         }
 
+#if !NOFILES        
         // ================ LineBuffer Initialization ===================
+
         /// <summary>
         /// Create and initialize a LineBuff buffer object for this scanner
         /// </summary>
@@ -400,7 +399,6 @@ int NextState() {
             GetCode();
         }
 
-#if !NOFILES        
         // =============== StreamBuffer Initialization ==================
 
         /// <summary>
@@ -502,12 +500,6 @@ int NextState() {
             }
         }
 
-        /// <summary>
-        /// Discards all but the first "n" codepoints in the recognized pattern.
-        /// Resets the buffer position so that only n codepoints have been consumed;
-        /// yytext is also re-evaluated. 
-        /// </summary>
-        /// <param name="n">The number of codepoints to consume</param>
         [SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
         void yyless(int n)
         {
@@ -527,10 +519,6 @@ int NextState() {
         //  but it does not seem possible to re-establish
         //  the correct column counts except by going forward.
         //
-        /// <summary>
-        /// Removes the last "n" code points from the pattern.
-        /// </summary>
-        /// <param name="n">The number to remove</param>
         [SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
         void _yytrunc(int n) { yyless(yyleng - n); }
         
@@ -543,23 +531,18 @@ int NextState() {
         // can't use (tokEPos - tokPos) because of the
         // possibility of surrogate pairs in the token.
         //
-        /// <summary>
-        /// The length of the pattern in codepoints (not the same as 
-        /// string-length if the pattern contains any surrogate pairs).
-        /// </summary>
         [SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
         [SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "yyleng")]
         [SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly", MessageId = "yyleng")]
         public int yyleng
         {
             get {
+#if BYTEMODE
+                return tokEPos - tokPos;
+#else   
                 if (tokELin == tokLin)
                     return tokECol - tokCol;
-                else
-#if BYTEMODE
-                    return tokEPos - tokPos;
-#else
-                {
+                else {
                     int ch;
                     int count = 0;
                     int save = buffer.Pos;
@@ -568,7 +551,7 @@ int NextState() {
                         ch = buffer.Read();
                         if (!char.IsHighSurrogate((char)ch)) count++;
                     } while (buffer.Pos < tokEPos && ch != ScanBuff.EndOfFile);
-                    buffer.Pos = save;
+                    buffer.Pos = save; 
                     return count;
                 }
 #endif // BYTEMODE
@@ -593,56 +576,65 @@ int NextState() {
 
         // ============== The main tokenizer code =================
 
-        int Scan() {
+        int Scan()
+        {
             try {
-                for (; ; ) {
-                    int next;              // next state to enter
+                for (; ; )
+                {
+                    int next;              // next state to enter                   
+#if BACKUP
+                    Result rslt = Result.noMatch;
+#endif // BACKUP
 #if LEFTANCHORS
-                    for (;;) {
+                    for (;;)
+                    {
                         // Discard characters that do not start any pattern.
                         // Must check the left anchor condition after *every* GetCode!
                         state = ((cCol == 0) ? anchorState[currentScOrd] : currentStart);
-                        if ((next = NextState()) != goStart) break; // LOOP EXIT HERE...
+                        if ((next = NextState()) != goStart) 
+                            break; // LOOP EXIT HERE...
                         GetCode();
                     }
                     
 #else // !LEFTANCHORS
                     state = currentStart;
-                    while ((next = NextState()) == goStart) {
+                    while ((next = NextState()) == goStart)
                         // At this point, the current character has no
                         // transition from the current state.  We discard 
                         // the "no-match" char.   In traditional LEX such 
                         // characters are echoed to the console.
                         GetCode();
-                    }
 #endif // LEFTANCHORS                    
                     // At last, a valid transition ...    
                     MarkToken();
                     state = next;
-                    GetCode();                    
+                    GetCode();
+                    
+                    while ((next = NextState()) > eofNum) // Exit for goStart AND for eofNum
 #if BACKUP
-                    bool contextSaved = false;
-                    while ((next = NextState()) > eofNum) { // Exit for goStart AND for eofNum
-                        if (state <= maxAccept && next > maxAccept) { // need to prepare backup data
-                            // Store data for the *latest* accept state that was found.
-                            SaveStateAndPos( ref ctx );
-                            contextSaved = true;
+                        if (state <= maxAccept && next > maxAccept) // need to prepare backup data
+                        {
+                            // ctx is an object. The fields may be 
+                            // mutated by the call to Recurse2.
+                            // On return the data in ctx is the
+                            // *latest* accept state that was found.
+                            
+                            rslt = Recurse2(ref ctx, next);
+                            if (rslt == Result.noMatch) 
+                                RestoreStateAndPos(ref ctx);
+                            break;
                         }
-                        state = next;
-                        GetCode();
-                    }
-                    if (state > maxAccept && contextSaved)
-                        RestoreStateAndPos( ref ctx );
-#else  // BACKUP
-                    while ((next = NextState()) > eofNum) { // Exit for goStart AND for eofNum
-                         state = next;
-                         GetCode();
-                    }
+                        else
 #endif // BACKUP
-                    if (state <= maxAccept) {
+                        {
+                            state = next;
+                            GetCode();
+                        }
+                    if (state <= maxAccept) 
+                    {
                         MarkEnd();
 #region ActionSwitch
-#pragma warning disable 162, 1522
+#pragma warning disable 162
     switch (state)
     {
         case eofNum:
@@ -706,7 +698,7 @@ yylval.dVal = double.Parse(yytext);
         default:
             break;
     }
-#pragma warning restore 162, 1522
+#pragma warning restore 162
 #endregion
                     }
                 }
@@ -719,7 +711,29 @@ yylloc = new LexLocation(tokLin, tokCol, tokELin, tokECol);
         }
 
 #if BACKUP
-        void SaveStateAndPos(ref Context ctx) {
+        Result Recurse2(ref Context ctx, int next)
+        {
+            // Assert: at entry "state" is an accept state AND
+            //         NextState(state, code) != goStart AND
+            //         NextState(state, code) is not an accept state.
+            //
+            SaveStateAndPos(ref ctx);
+            state = next;
+            GetCode();
+
+            while ((next = NextState()) > eofNum)
+            {
+                if (state <= maxAccept && next > maxAccept) // need to update backup data
+                    SaveStateAndPos(ref ctx);
+                state = next;
+                if (state == eofNum) return Result.accept;
+                GetCode(); 
+            }
+            return (state <= maxAccept ? Result.accept : Result.noMatch);
+        }
+
+        void SaveStateAndPos(ref Context ctx)
+        {
             ctx.bPos  = buffer.Pos;
             ctx.rPos  = readPos;
             ctx.cCol  = cCol;
@@ -728,7 +742,8 @@ yylloc = new LexLocation(tokLin, tokCol, tokELin, tokECol);
             ctx.cChr  = code;
         }
 
-        void RestoreStateAndPos(ref Context ctx) {
+        void RestoreStateAndPos(ref Context ctx)
+        {
             buffer.Pos = ctx.bPos;
             readPos = ctx.rPos;
             cCol  = ctx.cCol;
@@ -736,7 +751,8 @@ yylloc = new LexLocation(tokLin, tokCol, tokELin, tokECol);
             state = ctx.state;
             code  = ctx.cChr;
         }
-#endif  // BACKUP
+
+#endif // BACKUP
 
         // ============= End of the tokenizer code ================
 
@@ -768,16 +784,16 @@ yylloc = new LexLocation(tokLin, tokCol, tokELin, tokECol);
         
 #region UserCodeSection
 
-public override void yyerror(string format, params object[] args) // îáðàáîòêà ñèíòàêñè÷åñêèõ îøèáîê
+public override void yyerror(string format, params object[] args) // обработка синтаксических ошибок
 {
   var ww = args.Skip(1).Cast<string>().ToArray();
-  string errorMsg = string.Format("({0},{1}): Âñòðå÷åíî {2}, à îæèäàëîñü {3}", yyline, yycol, args[0], string.Join(" èëè ", ww));
+  string errorMsg = string.Format("({0},{1}): Встречено {2}, а ожидалось {3}", yyline, yycol, args[0], string.Join(" или ", ww));
   throw new SyntaxException(errorMsg);
 }
 
 public void LexError()
 {
-  string errorMsg = string.Format("({0},{1}): Íåèçâåñòíûé ñèìâîë {2}", yyline, yycol, yytext);
+  string errorMsg = string.Format("({0},{1}): Неизвестный символ {2}", yyline, yycol, yytext);
   throw new LexException(errorMsg);
 }
 
@@ -793,6 +809,9 @@ class ScannerHelper
     keywords.Add("cycle",(int)Tokens.CYCLE);
     keywords.Add("write",(int)Tokens.WRITE);
     keywords.Add("var",(int)Tokens.VAR);
+	keywords.Add("if",(int)Tokens.IF);
+	keywords.Add("then",(int)Tokens.THEN);
+	keywords.Add("else",(int)Tokens.ELSE);
   }
   public static int GetIDToken(string s)
   {
@@ -853,7 +872,6 @@ class ScannerHelper
             return new LineBuffer(source);
         }
 
-#if (!NOFILES)
         public static ScanBuff GetBuffer(Stream source)
         {
             return new BuildBuffer(source);
@@ -864,8 +882,7 @@ class ScannerHelper
         {
             return new BuildBuffer(source, fallbackCodePage);
         }
-#endif // !BYTEMODE
-#endif // !NOFILES
+#endif
     }
 
     #region Buffer classes
@@ -988,7 +1005,7 @@ class ScannerHelper
             {
                 ix = lstart = 0;
             }
-            while (ix < numLines)
+            for (; ; )
             {
                 int len = line[ix].Length + 1;
                 if (pos < lstart + len) break;
@@ -1046,8 +1063,7 @@ class ScannerHelper
             {
                 cPos = value;
                 findIndex(cPos, out cLine, out curLineStart);
-                // cLine should be the *next* line after curLine.
-                curLine = (cLine < numLines ? line[cLine++] : "");
+                curLine = line[cLine];
                 curLineEnd = curLineStart + curLine.Length;
             }
         }
@@ -1055,7 +1071,7 @@ class ScannerHelper
         public override string ToString() { return "LineBuffer"; }
     }
 
-#if (!NOFILES)
+
     // ==============================================================
     // =====     class BuildBuff : for unicode text files    ========
     // ==============================================================
@@ -1296,13 +1312,12 @@ class ScannerHelper
         }
 #endif // !BYTEMODE
     }
-#endif // !NOFILES
     #endregion Buffer classes
 
     // ==============================================================
     // ============      class CodePageHandling         =============
     // ==============================================================
-#if (!NOFILES)
+
     public static class CodePageHandling
     {
         public static int GetCodePage(string option)
@@ -1513,7 +1528,6 @@ class ScannerHelper
     
 #endif // !BYTEMODE
 #endregion
-#endif // !NOFILES
 
 // End of code copied from embedded resource
 
diff --git a/Module7/SimpleLex.lex b/Module7/SimpleLex.lex
index 00dfa1249dd0572b3061e40d49d86058b4e1baee..4a392d9d7f03f0cf6ee15a9bf02ecc06f2c9129c 100644
--- a/Module7/SimpleLex.lex
+++ b/Module7/SimpleLex.lex
@@ -78,6 +78,9 @@ class ScannerHelper
     keywords.Add("cycle",(int)Tokens.CYCLE);
     keywords.Add("write",(int)Tokens.WRITE);
     keywords.Add("var",(int)Tokens.VAR);
+	keywords.Add("if",(int)Tokens.IF);
+	keywords.Add("then",(int)Tokens.THEN);
+	keywords.Add("else",(int)Tokens.ELSE);
   }
   public static int GetIDToken(string s)
   {
diff --git a/Module7/SimpleYacc.cs b/Module7/SimpleYacc.cs
index e0ec2ad6ff794b912c8c7509d7cc14a3103253c0..da799da84ca1050013f01459f6f8c97d18f8f132 100644
--- a/Module7/SimpleYacc.cs
+++ b/Module7/SimpleYacc.cs
@@ -1,18 +1,17 @@
 // This code was generated by the Gardens Point Parser Generator
-// Copyright (c) Wayne Kelly, John Gough, QUT 2005-2014
+// Copyright (c) Wayne Kelly, QUT 2005-2010
 // (see accompanying GPPGcopyright.rtf)
 
-// GPPG version 1.5.2
-// Machine:  MAINHOMEPC2
-// DateTime: 30.09.2018 18:17:29
-// UserName: someone
-// Input file <SimpleYacc.y - 24.09.2018 23:47:03>
+// GPPG version 1.3.6
+// Machine:  DESKTOP-H0VRSS3
+// DateTime: 06.11.2022 21:58:12
+// UserName: nikit
+// Input file <SimpleYacc.y>
 
 // options: no-lines gplex
 
 using System;
 using System.Collections.Generic;
-using System.CodeDom.Compiler;
 using System.Globalization;
 using System.Text;
 using QUT.Gppg;
@@ -21,10 +20,12 @@ using ProgramTree;
 
 namespace SimpleParser
 {
-public enum Tokens {error=2,EOF=3,BEGIN=4,END=5,CYCLE=6,
-    ASSIGN=7,ASSIGNPLUS=8,ASSIGNMINUS=9,ASSIGNMULT=10,SEMICOLON=11,WRITE=12,
-    VAR=13,PLUS=14,MINUS=15,MULT=16,DIV=17,LPAREN=18,
-    RPAREN=19,COLUMN=20,INUM=21,RNUM=22,ID=23};
+public enum Tokens {
+    error=1,EOF=2,BEGIN=3,END=4,CYCLE=5,ASSIGN=6,
+    ASSIGNPLUS=7,ASSIGNMINUS=8,ASSIGNMULT=9,SEMICOLON=10,WRITE=11,VAR=12,
+    PLUS=13,MINUS=14,MULT=15,DIV=16,LPAREN=17,RPAREN=18,
+    COLUMN=19,IF=20,THEN=21,ELSE=22,INUM=23,RNUM=24,
+    ID=25};
 
 public struct ValueType
 { 
@@ -37,124 +38,120 @@ public struct ValueType
 			public BlockNode blVal;
        }
 // Abstract base class for GPLEX scanners
-[GeneratedCodeAttribute( "Gardens Point Parser Generator", "1.5.2")]
 public abstract class ScanBase : AbstractScanner<ValueType,LexLocation> {
   private LexLocation __yylloc = new LexLocation();
   public override LexLocation yylloc { get { return __yylloc; } set { __yylloc = value; } }
   protected virtual bool yywrap() { return true; }
 }
 
-// Utility class for encapsulating token information
-[GeneratedCodeAttribute( "Gardens Point Parser Generator", "1.5.2")]
-public class ScanObj {
-  public int token;
-  public ValueType yylval;
-  public LexLocation yylloc;
-  public ScanObj( int t, ValueType val, LexLocation loc ) {
-    this.token = t; this.yylval = val; this.yylloc = loc;
-  }
-}
-
-[GeneratedCodeAttribute( "Gardens Point Parser Generator", "1.5.2")]
 public class Parser: ShiftReduceParser<ValueType, LexLocation>
 {
-  // Verbatim content from SimpleYacc.y - 24.09.2018 23:47:03
-// Ýòè îáúÿâëåíèÿ äîáàâëÿþòñÿ â êëàññ GPPGParser, ïðåäñòàâëÿþùèé ñîáîé ïàðñåð, ãåíåðèðóåìûé ñèñòåìîé gppg
-    public BlockNode root; // Êîðíåâîé óçåë ñèíòàêñè÷åñêîãî äåðåâà 
+  // Verbatim content from SimpleYacc.y
+// Эти объявления добавляются в класс GPPGParser, представляющий собой парсер, генерируемый системой gppg
+    public BlockNode root; // Корневой узел синтаксического дерева 
     public Parser(AbstractScanner<ValueType, LexLocation> scanner) : base(scanner) { }
 	private bool InDefSect = false;
-  // End verbatim content from SimpleYacc.y - 24.09.2018 23:47:03
+  // End verbatim content from SimpleYacc.y
 
 #pragma warning disable 649
-  private static Dictionary<int, string> aliases;
+  private static Dictionary<int, string> aliasses;
 #pragma warning restore 649
-  private static Rule[] rules = new Rule[30];
-  private static State[] states = new State[48];
+  private static Rule[] rules = new Rule[33];
+  private static State[] states = new State[55];
   private static string[] nonTerms = new string[] {
       "progr", "expr", "ident", "T", "F", "statement", "assign", "block", "cycle", 
-      "write", "empty", "var", "varlist", "stlist", "$accept", "Anon@1", };
+      "write", "empty", "var", "varlist", "if", "stlist", "$accept", "Anon@1", 
+      };
 
   static Parser() {
-    states[0] = new State(new int[]{4,4},new int[]{-1,1,-8,3});
-    states[1] = new State(new int[]{3,2});
+    states[0] = new State(new int[]{3,4},new int[]{-1,1,-8,3});
+    states[1] = new State(new int[]{2,2});
     states[2] = new State(-1);
     states[3] = new State(-2);
-    states[4] = new State(new int[]{23,18,4,4,6,31,12,35,13,40,5,-11,11,-11},new int[]{-14,5,-6,47,-7,9,-3,10,-8,29,-9,30,-10,34,-12,39,-11,46});
-    states[5] = new State(new int[]{5,6,11,7});
-    states[6] = new State(-23);
-    states[7] = new State(new int[]{23,18,4,4,6,31,12,35,13,40,5,-11,11,-11},new int[]{-6,8,-7,9,-3,10,-8,29,-9,30,-10,34,-12,39,-11,46});
+    states[4] = new State(new int[]{25,18,3,4,5,31,11,35,12,40,20,48,4,-12,10,-12},new int[]{-15,5,-6,54,-7,9,-3,10,-8,29,-9,30,-10,34,-12,39,-11,46,-14,47});
+    states[5] = new State(new int[]{4,6,10,7});
+    states[6] = new State(-24);
+    states[7] = new State(new int[]{25,18,3,4,5,31,11,35,12,40,20,48,4,-12,10,-12},new int[]{-6,8,-7,9,-3,10,-8,29,-9,30,-10,34,-12,39,-11,46,-14,47});
     states[8] = new State(-4);
     states[9] = new State(-5);
-    states[10] = new State(new int[]{7,11});
-    states[11] = new State(new int[]{23,18,21,19,18,20},new int[]{-2,12,-4,28,-5,27,-3,17});
-    states[12] = new State(new int[]{14,13,15,23,5,-13,11,-13});
-    states[13] = new State(new int[]{23,18,21,19,18,20},new int[]{-4,14,-5,27,-3,17});
-    states[14] = new State(new int[]{16,15,17,25,14,-14,15,-14,5,-14,11,-14,19,-14,23,-14,4,-14,6,-14,12,-14,13,-14});
-    states[15] = new State(new int[]{23,18,21,19,18,20},new int[]{-5,16,-3,17});
-    states[16] = new State(-17);
-    states[17] = new State(-20);
-    states[18] = new State(-12);
-    states[19] = new State(-21);
-    states[20] = new State(new int[]{23,18,21,19,18,20},new int[]{-2,21,-4,28,-5,27,-3,17});
-    states[21] = new State(new int[]{19,22,14,13,15,23});
-    states[22] = new State(-22);
-    states[23] = new State(new int[]{23,18,21,19,18,20},new int[]{-4,24,-5,27,-3,17});
-    states[24] = new State(new int[]{16,15,17,25,14,-15,15,-15,5,-15,11,-15,19,-15,23,-15,4,-15,6,-15,12,-15,13,-15});
-    states[25] = new State(new int[]{23,18,21,19,18,20},new int[]{-5,26,-3,17});
-    states[26] = new State(-18);
-    states[27] = new State(-19);
-    states[28] = new State(new int[]{16,15,17,25,14,-16,15,-16,5,-16,11,-16,19,-16,23,-16,4,-16,6,-16,12,-16,13,-16});
+    states[10] = new State(new int[]{6,11});
+    states[11] = new State(new int[]{25,18,23,19,17,20},new int[]{-2,12,-4,28,-5,27,-3,17});
+    states[12] = new State(new int[]{13,13,14,23,4,-14,10,-14,22,-14});
+    states[13] = new State(new int[]{25,18,23,19,17,20},new int[]{-4,14,-5,27,-3,17});
+    states[14] = new State(new int[]{15,15,16,25,13,-15,14,-15,4,-15,10,-15,22,-15,18,-15,25,-15,3,-15,5,-15,11,-15,12,-15,20,-15,21,-15});
+    states[15] = new State(new int[]{25,18,23,19,17,20},new int[]{-5,16,-3,17});
+    states[16] = new State(-18);
+    states[17] = new State(-21);
+    states[18] = new State(-13);
+    states[19] = new State(-22);
+    states[20] = new State(new int[]{25,18,23,19,17,20},new int[]{-2,21,-4,28,-5,27,-3,17});
+    states[21] = new State(new int[]{18,22,13,13,14,23});
+    states[22] = new State(-23);
+    states[23] = new State(new int[]{25,18,23,19,17,20},new int[]{-4,24,-5,27,-3,17});
+    states[24] = new State(new int[]{15,15,16,25,13,-16,14,-16,4,-16,10,-16,22,-16,18,-16,25,-16,3,-16,5,-16,11,-16,12,-16,20,-16,21,-16});
+    states[25] = new State(new int[]{25,18,23,19,17,20},new int[]{-5,26,-3,17});
+    states[26] = new State(-19);
+    states[27] = new State(-20);
+    states[28] = new State(new int[]{15,15,16,25,13,-17,14,-17,4,-17,10,-17,22,-17,18,-17,25,-17,3,-17,5,-17,11,-17,12,-17,20,-17,21,-17});
     states[29] = new State(-6);
     states[30] = new State(-7);
-    states[31] = new State(new int[]{23,18,21,19,18,20},new int[]{-2,32,-4,28,-5,27,-3,17});
-    states[32] = new State(new int[]{14,13,15,23,23,18,4,4,6,31,12,35,13,40,5,-11,11,-11},new int[]{-6,33,-7,9,-3,10,-8,29,-9,30,-10,34,-12,39,-11,46});
-    states[33] = new State(-24);
+    states[31] = new State(new int[]{25,18,23,19,17,20},new int[]{-2,32,-4,28,-5,27,-3,17});
+    states[32] = new State(new int[]{13,13,14,23,25,18,3,4,5,31,11,35,12,40,20,48,4,-12,10,-12,22,-12},new int[]{-6,33,-7,9,-3,10,-8,29,-9,30,-10,34,-12,39,-11,46,-14,47});
+    states[33] = new State(-25);
     states[34] = new State(-8);
-    states[35] = new State(new int[]{18,36});
-    states[36] = new State(new int[]{23,18,21,19,18,20},new int[]{-2,37,-4,28,-5,27,-3,17});
-    states[37] = new State(new int[]{19,38,14,13,15,23});
-    states[38] = new State(-25);
+    states[35] = new State(new int[]{17,36});
+    states[36] = new State(new int[]{25,18,23,19,17,20},new int[]{-2,37,-4,28,-5,27,-3,17});
+    states[37] = new State(new int[]{18,38,13,13,14,23});
+    states[38] = new State(-26);
     states[39] = new State(-9);
-    states[40] = new State(-26,new int[]{-16,41});
-    states[41] = new State(new int[]{23,18},new int[]{-13,42,-3,45});
-    states[42] = new State(new int[]{20,43,5,-27,11,-27});
-    states[43] = new State(new int[]{23,18},new int[]{-3,44});
-    states[44] = new State(-29);
-    states[45] = new State(-28);
+    states[40] = new State(-27,new int[]{-17,41});
+    states[41] = new State(new int[]{25,18},new int[]{-13,42,-3,45});
+    states[42] = new State(new int[]{19,43,4,-28,10,-28,22,-28});
+    states[43] = new State(new int[]{25,18},new int[]{-3,44});
+    states[44] = new State(-30);
+    states[45] = new State(-29);
     states[46] = new State(-10);
-    states[47] = new State(-3);
-
-    for (int sNo = 0; sNo < states.Length; sNo++) states[sNo].number = sNo;
+    states[47] = new State(-11);
+    states[48] = new State(new int[]{25,18,23,19,17,20},new int[]{-2,49,-4,28,-5,27,-3,17});
+    states[49] = new State(new int[]{21,50,13,13,14,23});
+    states[50] = new State(new int[]{25,18,3,4,5,31,11,35,12,40,20,48,4,-12,10,-12,22,-12},new int[]{-6,51,-7,9,-3,10,-8,29,-9,30,-10,34,-12,39,-11,46,-14,47});
+    states[51] = new State(new int[]{22,52,4,-31,10,-31});
+    states[52] = new State(new int[]{25,18,3,4,5,31,11,35,12,40,20,48,4,-12,10,-12,22,-12},new int[]{-6,53,-7,9,-3,10,-8,29,-9,30,-10,34,-12,39,-11,46,-14,47});
+    states[53] = new State(-32);
+    states[54] = new State(-3);
 
-    rules[1] = new Rule(-15, new int[]{-1,3});
+    rules[1] = new Rule(-16, new int[]{-1,2});
     rules[2] = new Rule(-1, new int[]{-8});
-    rules[3] = new Rule(-14, new int[]{-6});
-    rules[4] = new Rule(-14, new int[]{-14,11,-6});
+    rules[3] = new Rule(-15, new int[]{-6});
+    rules[4] = new Rule(-15, new int[]{-15,10,-6});
     rules[5] = new Rule(-6, new int[]{-7});
     rules[6] = new Rule(-6, new int[]{-8});
     rules[7] = new Rule(-6, new int[]{-9});
     rules[8] = new Rule(-6, new int[]{-10});
     rules[9] = new Rule(-6, new int[]{-12});
     rules[10] = new Rule(-6, new int[]{-11});
-    rules[11] = new Rule(-11, new int[]{});
-    rules[12] = new Rule(-3, new int[]{23});
-    rules[13] = new Rule(-7, new int[]{-3,7,-2});
-    rules[14] = new Rule(-2, new int[]{-2,14,-4});
-    rules[15] = new Rule(-2, new int[]{-2,15,-4});
-    rules[16] = new Rule(-2, new int[]{-4});
-    rules[17] = new Rule(-4, new int[]{-4,16,-5});
-    rules[18] = new Rule(-4, new int[]{-4,17,-5});
-    rules[19] = new Rule(-4, new int[]{-5});
-    rules[20] = new Rule(-5, new int[]{-3});
-    rules[21] = new Rule(-5, new int[]{21});
-    rules[22] = new Rule(-5, new int[]{18,-2,19});
-    rules[23] = new Rule(-8, new int[]{4,-14,5});
-    rules[24] = new Rule(-9, new int[]{6,-2,-6});
-    rules[25] = new Rule(-10, new int[]{12,18,-2,19});
-    rules[26] = new Rule(-16, new int[]{});
-    rules[27] = new Rule(-12, new int[]{13,-16,-13});
-    rules[28] = new Rule(-13, new int[]{-3});
-    rules[29] = new Rule(-13, new int[]{-13,20,-3});
+    rules[11] = new Rule(-6, new int[]{-14});
+    rules[12] = new Rule(-11, new int[]{});
+    rules[13] = new Rule(-3, new int[]{25});
+    rules[14] = new Rule(-7, new int[]{-3,6,-2});
+    rules[15] = new Rule(-2, new int[]{-2,13,-4});
+    rules[16] = new Rule(-2, new int[]{-2,14,-4});
+    rules[17] = new Rule(-2, new int[]{-4});
+    rules[18] = new Rule(-4, new int[]{-4,15,-5});
+    rules[19] = new Rule(-4, new int[]{-4,16,-5});
+    rules[20] = new Rule(-4, new int[]{-5});
+    rules[21] = new Rule(-5, new int[]{-3});
+    rules[22] = new Rule(-5, new int[]{23});
+    rules[23] = new Rule(-5, new int[]{17,-2,18});
+    rules[24] = new Rule(-8, new int[]{3,-15,4});
+    rules[25] = new Rule(-9, new int[]{5,-2,-6});
+    rules[26] = new Rule(-10, new int[]{11,17,-2,18});
+    rules[27] = new Rule(-17, new int[]{});
+    rules[28] = new Rule(-12, new int[]{12,-17,-13});
+    rules[29] = new Rule(-13, new int[]{-3});
+    rules[30] = new Rule(-13, new int[]{-13,19,-3});
+    rules[31] = new Rule(-14, new int[]{20,-2,21,-6});
+    rules[32] = new Rule(-14, new int[]{20,-2,21,-6,22,-6});
   }
 
   protected override void Initialize() {
@@ -166,7 +163,6 @@ public class Parser: ShiftReduceParser<ValueType, LexLocation>
 
   protected override void DoAction(int action)
   {
-#pragma warning disable 162, 1522
     switch (action)
     {
       case 2: // progr -> block
@@ -201,85 +197,93 @@ public class Parser: ShiftReduceParser<ValueType, LexLocation>
       case 10: // statement -> empty
 { CurrentSemanticValue.stVal = ValueStack[ValueStack.Depth-1].stVal; }
         break;
-      case 11: // empty -> /* empty */
+      case 11: // statement -> if
+{ CurrentSemanticValue.stVal = ValueStack[ValueStack.Depth-1].stVal; }
+        break;
+      case 12: // empty -> /* empty */
 { CurrentSemanticValue.stVal = new EmptyNode(); }
         break;
-      case 12: // ident -> ID
+      case 13: // ident -> ID
 {
 			if (!InDefSect)
 				if (!SymbolTable.vars.ContainsKey(ValueStack[ValueStack.Depth-1].sVal))
-					throw new Exception("("+LocationStack[LocationStack.Depth-1].StartLine+","+LocationStack[LocationStack.Depth-1].StartColumn+"): Ïåðåìåííàÿ "+ValueStack[ValueStack.Depth-1].sVal+" íå îïèñàíà");
+					throw new Exception("("+LocationStack[LocationStack.Depth-1].StartLine+","+LocationStack[LocationStack.Depth-1].StartColumn+"): Переменная "+ValueStack[ValueStack.Depth-1].sVal+" не описана");
 			CurrentSemanticValue.eVal = new IdNode(ValueStack[ValueStack.Depth-1].sVal); 
 		}
         break;
-      case 13: // assign -> ident, ASSIGN, expr
+      case 14: // assign -> ident, ASSIGN, expr
 { CurrentSemanticValue.stVal = new AssignNode(ValueStack[ValueStack.Depth-3].eVal as IdNode, ValueStack[ValueStack.Depth-1].eVal); }
         break;
-      case 14: // expr -> expr, PLUS, T
+      case 15: // expr -> expr, PLUS, T
 { CurrentSemanticValue.eVal = new BinOpNode(ValueStack[ValueStack.Depth-3].eVal,ValueStack[ValueStack.Depth-1].eVal,'+'); }
         break;
-      case 15: // expr -> expr, MINUS, T
+      case 16: // expr -> expr, MINUS, T
 { CurrentSemanticValue.eVal = new BinOpNode(ValueStack[ValueStack.Depth-3].eVal,ValueStack[ValueStack.Depth-1].eVal,'-'); }
         break;
-      case 16: // expr -> T
+      case 17: // expr -> T
 { CurrentSemanticValue.eVal = ValueStack[ValueStack.Depth-1].eVal; }
         break;
-      case 17: // T -> T, MULT, F
+      case 18: // T -> T, MULT, F
 { CurrentSemanticValue.eVal = new BinOpNode(ValueStack[ValueStack.Depth-3].eVal,ValueStack[ValueStack.Depth-1].eVal,'*'); }
         break;
-      case 18: // T -> T, DIV, F
+      case 19: // T -> T, DIV, F
 { CurrentSemanticValue.eVal = new BinOpNode(ValueStack[ValueStack.Depth-3].eVal,ValueStack[ValueStack.Depth-1].eVal,'/'); }
         break;
-      case 19: // T -> F
+      case 20: // T -> F
 { CurrentSemanticValue.eVal = ValueStack[ValueStack.Depth-1].eVal; }
         break;
-      case 20: // F -> ident
+      case 21: // F -> ident
 { CurrentSemanticValue.eVal = ValueStack[ValueStack.Depth-1].eVal as IdNode; }
         break;
-      case 21: // F -> INUM
+      case 22: // F -> INUM
 { CurrentSemanticValue.eVal = new IntNumNode(ValueStack[ValueStack.Depth-1].iVal); }
         break;
-      case 22: // F -> LPAREN, expr, RPAREN
+      case 23: // F -> LPAREN, expr, RPAREN
 { CurrentSemanticValue.eVal = ValueStack[ValueStack.Depth-2].eVal; }
         break;
-      case 23: // block -> BEGIN, stlist, END
+      case 24: // block -> BEGIN, stlist, END
 { CurrentSemanticValue.blVal = ValueStack[ValueStack.Depth-2].blVal; }
         break;
-      case 24: // cycle -> CYCLE, expr, statement
+      case 25: // cycle -> CYCLE, expr, statement
 { CurrentSemanticValue.stVal = new CycleNode(ValueStack[ValueStack.Depth-2].eVal,ValueStack[ValueStack.Depth-1].stVal); }
         break;
-      case 25: // write -> WRITE, LPAREN, expr, RPAREN
+      case 26: // write -> WRITE, LPAREN, expr, RPAREN
 { CurrentSemanticValue.stVal = new WriteNode(ValueStack[ValueStack.Depth-2].eVal); }
         break;
-      case 26: // Anon@1 -> /* empty */
+      case 27: // Anon@1 -> /* empty */
 { InDefSect = true; }
         break;
-      case 27: // var -> VAR, Anon@1, varlist
+      case 28: // var -> VAR, Anon@1, varlist
 { 
 			foreach (var v in (ValueStack[ValueStack.Depth-1].stVal as VarDefNode).vars)
 				SymbolTable.NewVarDef(v.Name, type.tint);
 			InDefSect = false;	
 		}
         break;
-      case 28: // varlist -> ident
+      case 29: // varlist -> ident
 { 
 			CurrentSemanticValue.stVal = new VarDefNode(ValueStack[ValueStack.Depth-1].eVal as IdNode); 
 		}
         break;
-      case 29: // varlist -> varlist, COLUMN, ident
+      case 30: // varlist -> varlist, COLUMN, ident
 { 
 			(ValueStack[ValueStack.Depth-3].stVal as VarDefNode).Add(ValueStack[ValueStack.Depth-1].eVal as IdNode);
 			CurrentSemanticValue.stVal = ValueStack[ValueStack.Depth-3].stVal;
 		}
         break;
+      case 31: // if -> IF, expr, THEN, statement
+{ CurrentSemanticValue.stVal = new IfNode(ValueStack[ValueStack.Depth-3].eVal, ValueStack[ValueStack.Depth-1].stVal); }
+        break;
+      case 32: // if -> IF, expr, THEN, statement, ELSE, statement
+{ CurrentSemanticValue.stVal = new IfNode(ValueStack[ValueStack.Depth-5].eVal, ValueStack[ValueStack.Depth-3].stVal, ValueStack[ValueStack.Depth-1].stVal); }
+        break;
     }
-#pragma warning restore 162, 1522
   }
 
   protected override string TerminalToString(int terminal)
   {
-    if (aliases != null && aliases.ContainsKey(terminal))
-        return aliases[terminal];
+    if (aliasses != null && aliasses.ContainsKey(terminal))
+        return aliasses[terminal];
     else if (((Tokens)terminal).ToString() != terminal.ToString(CultureInfo.InvariantCulture))
         return ((Tokens)terminal).ToString();
     else
diff --git a/Module7/SimpleYacc.y b/Module7/SimpleYacc.y
index 20087e00b11254a052c1bfcd87f137d81203b253..42a88a6f6948d50a74d775a210cdd6fbb0049dfe 100644
--- a/Module7/SimpleYacc.y
+++ b/Module7/SimpleYacc.y
@@ -24,13 +24,13 @@
 
 %start progr
 
-%token BEGIN END CYCLE ASSIGN ASSIGNPLUS ASSIGNMINUS ASSIGNMULT SEMICOLON WRITE VAR PLUS MINUS MULT DIV LPAREN RPAREN COLUMN
+%token BEGIN END CYCLE ASSIGN ASSIGNPLUS ASSIGNMINUS ASSIGNMULT SEMICOLON WRITE VAR PLUS MINUS MULT DIV LPAREN RPAREN COLUMN IF THEN ELSE
 %token <iVal> INUM 
 %token <dVal> RNUM 
 %token <sVal> ID
 
 %type <eVal> expr ident T F 
-%type <stVal> statement assign block cycle write empty var varlist 
+%type <stVal> statement assign block cycle write empty var varlist if
 %type <blVal> stlist block
 
 %%
@@ -55,6 +55,7 @@ statement: assign { $$ = $1; }
 		| write   { $$ = $1; }
 		| var     { $$ = $1; }
 		| empty   { $$ = $1; }
+		| if { $$ = $1; }
 		;
 
 empty	: { $$ = new EmptyNode(); }
@@ -114,6 +115,10 @@ varlist	: ident
 			$$ = $1;
 		}
 		;
+		
+if		: IF expr THEN statement { $$ = new IfNode($2, $4); }
+		| IF expr THEN statement ELSE statement { $$ = new IfNode($2, $4, $6); }
+		;
 	
 %%
 
diff --git a/Module7/Visitors/AutoVisitor.cs b/Module7/Visitors/AutoVisitor.cs
index 4bc07787c1c5f14bc9f05ff665e570994bd17e63..0f303e4a261d6259614e155377dc50b63368ea50 100644
--- a/Module7/Visitors/AutoVisitor.cs
+++ b/Module7/Visitors/AutoVisitor.cs
@@ -41,5 +41,12 @@ namespace SimpleLang.Visitors
             foreach (var v in w.vars)
                 v.Visit(this);
         }
+        public override void VisitIfNode(IfNode node)
+        {
+            node.Expr.Visit(this);
+            node.ThenStat.Visit(this);
+            if (node.ElseStat != null)
+                node.ElseStat.Visit(this);
+        }
     }
 }
diff --git a/Module7/Visitors/ChangeVarIdVisitor.cs b/Module7/Visitors/ChangeVarIdVisitor.cs
index 7e8942df896a2c4f3d4539a1ae3012d3bb483cc4..0c03306e3ac90c34294088a234326166c78280f2 100644
--- a/Module7/Visitors/ChangeVarIdVisitor.cs
+++ b/Module7/Visitors/ChangeVarIdVisitor.cs
@@ -15,6 +15,12 @@ namespace SimpleLang.Visitors
             from = _from;
             to = _to;
         }
-       
+
+        public override void VisitIdNode(IdNode id)
+        {
+            if (id.Name == from)
+                id.Name = to;
+        }
+
     }
 }
diff --git a/Module7/Visitors/CommonlyUsedVarVisitor.cs b/Module7/Visitors/CommonlyUsedVarVisitor.cs
index a73e3b6cfeb2662db626d3649d7cefc95e687c2d..772f0dee206a9b5761d26fb4452f04be2f944a1b 100644
--- a/Module7/Visitors/CommonlyUsedVarVisitor.cs
+++ b/Module7/Visitors/CommonlyUsedVarVisitor.cs
@@ -3,14 +3,35 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using ProgramTree;
+using static System.Net.Mime.MediaTypeNames;
 
 namespace SimpleLang.Visitors
 {
     public class CommonlyUsedVarVisitor : AutoVisitor
     {
+        public Dictionary<string, int> Variables = new Dictionary<string, int>();
         public string mostCommonlyUsedVar()
         {
-            throw new NotImplementedException();
+            int MaxNumber = -1;
+            string MostCommonVariable = "";
+            foreach(var kv in Variables)
+            {
+                if (kv.Value > MaxNumber)
+                {
+                    MaxNumber = kv.Value;
+                    MostCommonVariable = kv.Key;
+                }
+            }
+            return MostCommonVariable;
         }
+
+        public override void VisitIdNode(IdNode id)
+        {
+            if (Variables.ContainsKey(id.Name))
+                Variables[id.Name] += 1;
+            else
+                Variables[id.Name] = 1;
+        }
+
     }
 }
diff --git a/Module7/Visitors/CountCyclesOpVisitor.cs b/Module7/Visitors/CountCyclesOpVisitor.cs
index 5b5368b01bb2ece936bdcff542998c8c01009aa5..538777e195b179e0b008d7195faea69cbde33706 100644
--- a/Module7/Visitors/CountCyclesOpVisitor.cs
+++ b/Module7/Visitors/CountCyclesOpVisitor.cs
@@ -8,9 +8,31 @@ namespace SimpleLang.Visitors
 {
     public class CountCyclesOpVisitor : AutoVisitor
     {
+        public int OverallCyclesNumber = 0;
+        public int CurrentCyclesNumber = 0;
+        public int OpsNumber = 0;
+
         public int MidCount()
         {
-            throw new NotImplementedException();
+            if (OpsNumber > 0)
+                return OpsNumber / OverallCyclesNumber;
+            else
+                return 0;
+        }
+
+        public override void VisitCycleNode(CycleNode c)
+        {
+            ++OverallCyclesNumber;
+            ++CurrentCyclesNumber;
+            base.VisitCycleNode(c);
+            --CurrentCyclesNumber;
+        }
+
+        public override void VisitAssignNode(AssignNode c)
+        {
+            if (CurrentCyclesNumber > 0)
+                ++OpsNumber;
+            base.VisitAssignNode(c);
         }
     }
 }
diff --git a/Module7/Visitors/ExprComplexityVisitor.cs b/Module7/Visitors/ExprComplexityVisitor.cs
index ef9f0b2a9e8e6d76f0cb90d25515bea16760776e..1eefb6911e230cc4e74ce9df6e3bdbde22981eb1 100644
--- a/Module7/Visitors/ExprComplexityVisitor.cs
+++ b/Module7/Visitors/ExprComplexityVisitor.cs
@@ -8,11 +8,35 @@ namespace SimpleLang.Visitors
 {
     public class ExprComplexityVisitor : AutoVisitor
     {
+        public int OperationsDepth = 0;
+        public int OperationsComplexity = 0;
+        public List<int> ExpressionComplexity = new List<int>();
         // список должен содержать сложность каждого выражения, встреченного при обычном порядке обхода AST
         public List<int> getComplexityList()
         {
-            throw new NotImplementedException();
+            return ExpressionComplexity;
         }
 
-     }
+        public override void VisitBinOpNode(BinOpNode binop)
+        {
+            if (binop.Op == '+' || binop.Op == '-')
+                OperationsComplexity += 1;
+            else if (binop.Op == '*' || binop.Op == '/')
+                OperationsComplexity += 3;
+            ++OperationsDepth;
+            base.VisitBinOpNode(binop);
+            --OperationsDepth;
+            if (OperationsDepth == 0)
+            {
+                ExpressionComplexity.Add(OperationsComplexity);
+                OperationsComplexity = 0;
+            }
+        }
+
+        public override void VisitIntNumNode(IntNumNode num)
+        {
+            if (OperationsDepth == 0)
+                ExpressionComplexity.Add(OperationsComplexity);
+        }
+    }
 }
diff --git a/Module7/Visitors/MaxIfCycleNestVisitor.cs b/Module7/Visitors/MaxIfCycleNestVisitor.cs
index c399a8ec4e3a067d99e207abc8e8e04f1f0baadb..15cba64e903a5d7cb60e5b4a532626174ee1460f 100644
--- a/Module7/Visitors/MaxIfCycleNestVisitor.cs
+++ b/Module7/Visitors/MaxIfCycleNestVisitor.cs
@@ -10,5 +10,23 @@ namespace SimpleLang.Visitors
     public class MaxIfCycleNestVisitor : AutoVisitor
     {
         public int MaxNest = 0;
+        public int CurrentNest = 0;
+        public override void VisitIfNode(IfNode node)
+        {
+            ++CurrentNest;
+            if (CurrentNest > MaxNest)
+                MaxNest = CurrentNest;
+            base.VisitIfNode(node);
+            --CurrentNest;
+        }
+
+        public override void VisitCycleNode(CycleNode node)
+        {
+            ++CurrentNest;
+            if (CurrentNest > MaxNest)
+                MaxNest = CurrentNest;
+            base.VisitCycleNode(node);
+            --CurrentNest;
+        }
     }
 }
\ No newline at end of file
diff --git a/Module7/Visitors/MaxNestCyclesVisitor.cs b/Module7/Visitors/MaxNestCyclesVisitor.cs
index e5c768b4052dd05dd6eb58a87db533df5929cf0a..90791fdd3577079a154875dece0474950624da52 100644
--- a/Module7/Visitors/MaxNestCyclesVisitor.cs
+++ b/Module7/Visitors/MaxNestCyclesVisitor.cs
@@ -9,5 +9,14 @@ namespace SimpleLang.Visitors
     public class MaxNestCyclesVisitor : AutoVisitor
     {
         public int MaxNest = 0;
+        public int CurrentNest = 0;
+        public override void VisitCycleNode(CycleNode c)
+        {
+            ++CurrentNest;
+            if (CurrentNest > MaxNest)
+                MaxNest = CurrentNest;
+            base.VisitCycleNode(c);
+            --CurrentNest;
+        }
     }
 }
diff --git a/Module7/Visitors/PrettyPrintVisitor.cs b/Module7/Visitors/PrettyPrintVisitor.cs
index 87892b1214d751d13640e7adf61bd276ef870904..cf72badbae2b199c3b1da8135bd05f3645b4590f 100644
--- a/Module7/Visitors/PrettyPrintVisitor.cs
+++ b/Module7/Visitors/PrettyPrintVisitor.cs
@@ -84,5 +84,21 @@ namespace SimpleLang.Visitors
             for (int i = 1; i < w.vars.Count; i++)
                 Text += ',' + w.vars[i].Name;
         }
+        public override void VisitIfNode(IfNode w)
+        {
+            Text += IndentStr() + "if ";
+            w.Expr.Visit(this);
+            Text += " then" + Environment.NewLine;
+            IndentPlus();
+            w.ThenStat.Visit(this);
+            IndentMinus();
+            if (w.ElseStat != null)
+            {
+                Text += Environment.NewLine + IndentStr() + "else" + Environment.NewLine;
+                IndentPlus();
+                w.ElseStat.Visit(this);
+                IndentMinus();
+            }
+        }
     }
 }
diff --git a/Module7/Visitors/Visitor.cs b/Module7/Visitors/Visitor.cs
index b9dcae028c1c74893e7bf551cd0feccf5bcbf0c9..4270567e587eb2f79f5024519f71e3c9418808c8 100644
--- a/Module7/Visitors/Visitor.cs
+++ b/Module7/Visitors/Visitor.cs
@@ -17,5 +17,6 @@ namespace SimpleLang.Visitors
         public virtual void VisitWriteNode(WriteNode w) { }
         public virtual void VisitVarDefNode(VarDefNode w) { }
         public virtual void VisitEmptyNode(EmptyNode w) { }
+        public virtual void VisitIfNode(IfNode node) { }
     }
 }
diff --git a/TestVisitors/Tests.cs b/TestVisitors/Tests.cs
index a5d43a509bcc0eb6b91f8d6fc8d7853ee67b02f4..8e7018bb699ebcadfc97378d8e0c0b9a5ce284ed 100644
--- a/TestVisitors/Tests.cs
+++ b/TestVisitors/Tests.cs
@@ -20,7 +20,7 @@ namespace TestVisitors
     }
     
     [TestFixture]
-    [Ignore("This test is disabled")]
+    //[Ignore("This test is disabled")]
     public class TestAvgOpCount: ParserTest
     {
         [Test]
@@ -72,7 +72,7 @@ namespace TestVisitors
     }
     
     [TestFixture]
-    [Ignore("This test is disabled")]
+    //[Ignore("This test is disabled")]
     public class TestCommonVariable: ParserTest
     {
         [Test]
@@ -97,7 +97,7 @@ namespace TestVisitors
     }
     
     [TestFixture]
-    [Ignore("This test is disabled")]
+    //[Ignore("This test is disabled")]
     public class TestExprComplexity: ParserTest
     {
         [Test]
@@ -202,7 +202,7 @@ namespace TestVisitors
     }
     
     [TestFixture]
-    [Ignore("This test is disabled")]
+    //[Ignore("This test is disabled")]
     public class TestIfCycleNest: ParserTest
     {
         [Test]