diff --git a/str2num.h b/str2num.h
deleted file mode 100644
index 6f86c8c..0000000
--- a/str2num.h
+++ /dev/null
@@ -1,60 +0,0 @@
-#ifndef __STR2NUM_H__
-#define __STR2NUM_H__
-
-#include <iostream>
-#include <cstring>
-
-namespace nasal
-{
-
-void Str2Num(std::string &str)
-{
-	for(int i=0;i<(int)str.length();++i)
-		if(!(('0'<=str[i]) && (str[i]<='9') || (str[i]=='.')))
-		{
-			std::cout<<"[Error] Non-numeric string."<<std::endl;
-			return;
-		}
-	
-	bool isFloat=false;
-	int DotPlace=0;
-	for(int i=0;i<(int)str.length();++i)
-		if(str[i]=='.')
-		{
-			isFloat=true;
-			DotPlace=i;
-			break;
-		}
-	if(!isFloat)
-	{
-		long long int num=0;
-		long long int acc=1;
-		for(int i=(int)str.length()-1;i>=0;--i)
-		{
-			num+=acc*((long long int)(str[i]-'0'));
-			acc*=10;
-		}
-		std::cout<<num<<std::endl;
-	}
-	else
-	{
-		double num=0;
-		double acc=1;
-		double aff=0.1;
-		for(int i=DotPlace+1;i<(int)str.length();++i)
-		{
-			num+=aff*((double)(str[i]-'0'));
-			aff*=0.1;
-		}
-		for(int i=DotPlace-1;i>=0;--i)
-		{
-			num+=acc*((double)(str[i]-'0'));
-			acc*=10;
-		}
-		std::cout<<num<<std::endl;
-	}
-	return;
-}
-
-}
-#endif