diff --git a/SMILEBASIC/VM.d b/SMILEBASIC/VM.d
index 77ad1b5..8adaed0 100644
--- a/SMILEBASIC/VM.d
+++ b/SMILEBASIC/VM.d
@@ -112,7 +112,7 @@ class VM
     }
     void end()
     {
-        pc = code.length;
+        pc = cast(int)code.length;
     }
     void dump()
     {
diff --git a/SMILEBASIC/builtinfunctions.d b/SMILEBASIC/builtinfunctions.d
index a6aa56a..6aa7798 100644
--- a/SMILEBASIC/builtinfunctions.d
+++ b/SMILEBASIC/builtinfunctions.d
@@ -274,7 +274,7 @@ class BuiltinFunction
     //hairetuha?
     static int LEN(wstring str)
     {
-        return str.length;
+        return cast(int)str.length;
     }
     static double VAL(wstring str)
     {
@@ -360,8 +360,7 @@ class BuiltinFunction
             str1 = vstart.castString;
             str2 = vstr1.castString;
         }
-        int aaa = str1[start..$].indexOf(str2, CaseSensitive.no);
-        return str1[start..$].indexOf(str2, CaseSensitive.no);
+        return cast(int)(str1[start..$].indexOf(str2, CaseSensitive.no));
     }
     static int ASC(wstring str)
     {
@@ -508,7 +507,6 @@ class BuiltinFunction
                         return;
                     }
                     throw new IllegalFunctionCall("SPDEF");
-                    return;
                 }
             default:
         }
@@ -587,7 +585,7 @@ class BuiltinFunction
             auto f = format[i];
             if(f == '%')
             {
-                int d = indexOf(format, 'D', CaseSensitive.yes);
+                int d = cast(int)indexOf(format, 'D', CaseSensitive.yes);
                 if(d != -1)
                 {
                     auto spec = singleSpec(format[i .. d + 1]);
@@ -597,7 +595,7 @@ class BuiltinFunction
                     i = d;
                     continue;
                 }
-                d = indexOf(format, 'X', CaseSensitive.yes);
+                d = cast(int)indexOf(format, 'X', CaseSensitive.yes);
                 if(d != -1)
                 {
                     auto spec = singleSpec(format[i .. d + 1]);
@@ -607,7 +605,7 @@ class BuiltinFunction
                     i = d;
                     continue;
                 }
-                d = indexOf(format, 'S', CaseSensitive.yes);
+                d = cast(int)indexOf(format, 'S', CaseSensitive.yes);
                 if(d != -1)
                 {
                     auto spec = singleSpec(format[i .. d + 1]);
@@ -617,7 +615,7 @@ class BuiltinFunction
                     i = d;
                     continue;
                 }
-                d = indexOf(format, 'F', CaseSensitive.yes);
+                d = cast(int)indexOf(format, 'F', CaseSensitive.yes);
                 if(d != -1)
                 {
                     auto spec = singleSpec(format[i .. d + 1]);
diff --git a/SMILEBASIC/compiler.d b/SMILEBASIC/compiler.d
index d3f8737..1abe0b0 100644
--- a/SMILEBASIC/compiler.d
+++ b/SMILEBASIC/compiler.d
@@ -385,7 +385,7 @@ class Compiler
                         IndexExpressions ie = cast(IndexExpressions)binop.item2;
                         if(ie)
                         {
-                            genCode(new PushArray(ie.expressions.length));
+                            genCode(new PushArray(cast(int)ie.expressions.length));
                         }
                         else
                         {
@@ -428,12 +428,12 @@ class Compiler
                     }
                     if(bfun)
                     {
-                        genCode(new CallBuiltinFunction(bfun, func.args.length, 1));
+                        genCode(new CallBuiltinFunction(bfun, cast(int)func.args.length, 1));
                     }
                     else
                     {
                         writeln(func.name);
-                        genCode(new CallFunctionCode(func.name, func.args.length));
+                        genCode(new CallFunctionCode(func.name, cast(int)func.args.length));
                     }
                 }
                 break;
@@ -481,7 +481,7 @@ class Compiler
                         getVarIndex(var.name, sc, index, local);
                         if(ie)
                         {
-                            genCode(new PopArray(index, ie.expressions.length, local));
+                            genCode(new PopArray(index, cast(int)ie.expressions.length, local));
                         }
                         else
                         {
@@ -508,14 +508,14 @@ class Compiler
         if(node.hasElse)
         {
             then = genCodeGoto();
-            else_.address = code.length;
+            else_.address = cast(int)code.length;
             compileStatements(node.else_, sc);
-            then.address = code.length;
+            then.address = cast(int)code.length;
         }
         else
         {
             //endifに飛ばす
-            else_.address = code.length;
+            else_.address = cast(int)code.length;
         }
     }
     void compileFor(For node, Scope s)
@@ -540,7 +540,7 @@ class Compiler
         genCodeOP(TokenType.Greater);
         auto breakAddr = genCodeGotoTrue();
         auto forAddr = genCodeGoto();
-        positiveZero.address = code.length;
+        positiveZero.address = cast(int)code.length;
         //stepが正の値の時の処理
         //toよりcounterが大きい場合はBREAK
         //t c
@@ -551,7 +551,7 @@ class Compiler
         genCodePushVar(node.initExpression.name, s);
         genCodeOP(TokenType.Less);
         genCode(breakAddr);
-        forAddr.address = code.length;
+        forAddr.address = cast(int)code.length;
         s = new Scope(new GotoAddr(-1), new GotoAddr(-1), s);
         compileStatements(node.statements, s);
         s.continueAddr.address = code.length;
diff --git a/SMILEBASIC/type.d b/SMILEBASIC/type.d
index df1cd10..f15f454 100644
--- a/SMILEBASIC/type.d
+++ b/SMILEBASIC/type.d
@@ -151,7 +151,7 @@ class Array(T)
         {
             array[] = 0;
         }
-        dimCount = dim.length;
+        dimCount = cast(int)dim.length;
     }
     T opIndexAssign(T v, int[] dim)
     {