diff --git a/SMILEBASIC/main.d b/SMILEBASIC/main.d
index c26e9be..1163682 100644
--- a/SMILEBASIC/main.d
+++ b/SMILEBASIC/main.d
@@ -3,9 +3,9 @@ import otya.smilebasic.parser;
 int main(string[] argv)
 {
     writeln("Hello D-World!");
-    auto parser = new Parser("1+2");
-    writeln();
+    auto parser = new Parser("1+2*3+4");
     writeln(parser.calc());
+    writeln(1+2*3+4);
     readln();
     return 0;
 }
diff --git a/SMILEBASIC/node.d b/SMILEBASIC/node.d
index 321c98f..7ff592c 100644
--- a/SMILEBASIC/node.d
+++ b/SMILEBASIC/node.d
@@ -29,11 +29,17 @@ class BinaryOperator : Expression
     Expression item1;
     TokenType operator;
     Expression item2;
-    this(Expression i1, TokenType o)
+    this(BinaryOperator bop)
+    {
+        this.type = NodeType.BinaryOperator;
+        this.item1 = bop.item1;
+        this.operator = bop.operator;
+        this.item2 = bop.item2;
+    }
+    this(Expression i1)
     {
         this.type = NodeType.BinaryOperator;
         this.item1 = i1;
-        this.operator = o;
     }
     this(Expression i1, TokenType o, Expression i2)
     {
diff --git a/SMILEBASIC/parser.d b/SMILEBASIC/parser.d
index e8de6b8..f9c984a 100644
--- a/SMILEBASIC/parser.d
+++ b/SMILEBASIC/parser.d
@@ -141,6 +141,7 @@ class Parser
     int calc()
     {
         auto exp = expression();
+        writeln();
         return calc(exp);
     }
     int calc(Expression exp)
@@ -189,14 +190,20 @@ class Parser
         auto token = lex.front();
         if(order == getOPRank(token.type))
         {
-            BinaryOperator op = new BinaryOperator(exp, token.type);
+            BinaryOperator op = new BinaryOperator(exp);
             while(order == getOPRank(token.type))
             {
                 auto tt = token.type;
+                op.operator = token.type;
                 lex.popFront();
                 op.item2 = term(order - 1, node);
                 token = lex.front();
                 write(tt, " ");
+                if(order == getOPRank(token.type))
+                {
+                    BinaryOperator op2 = new BinaryOperator(op);
+                    op.item1 = op2;
+                }
                 stdout.flush();
             }
             return op;
@@ -221,3 +228,18 @@ class Parser
         return node;
     }
 }
+void test(wstring exp, int result)
+{
+    auto parser = new Parser(exp);
+    assert(parser.calc() == result);
+}
+//D言語の式の評価結果と同じか検証
+void Test(const char[] V)()
+{
+    mixin("writeln(\""~V~"\",\" = \" ,"~V~");test(\""~V~"\", "~V~");");
+}
+unittest
+{
+    Test!"2+20/5*3"();
+    Test!"2-3*4-5"();
+}