#include "Substr.h"
char *substr(const char *s,int n1,int n2) //取子串函數，從s中提取下標為n1~n2的字符組成一個新字符串，然后返回這個新串的首地址
{
	char *sp;
	sp=new char[n2-n1+2]; 
	int i,j=0; 
	for (i=n1; i<=n2; i++) 
	{ 
		sp[j++]=s[i]; 
	} 
	sp[j]=0; 
	return sp;
}