diff --git a/version0.4/nasal_functional.h b/version0.4/nasal_functional.h
deleted file mode 100644
index 9ec8d1d..0000000
--- a/version0.4/nasal_functional.h
+++ /dev/null
@@ -1,59 +0,0 @@
-#ifndef __NASAL_FUNCTIONAL_H__
-#define __NASAL_FUNCTIONAL_H__
-
-bool is_float(std::string &str)
-{
-	for(int i=0;i<(int)str.length();++i)
-		if(str[i]=='.')
-			return true;
-	return false;
-}
-long long int int_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 0;
-		}
-	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;
-	}
-	return num;
-}
-double double_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 0;
-		}
-	int DotPlace=0;
-	for(int i=0;i<(int)str.length();++i)
-		if(str[i]=='.')
-		{
-			DotPlace=i;
-			break;
-		}
-	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;
-	}
-	return num;
-}
-
-#endif