c++实现字符串回文判断

#include <iostream>  
using namespace std;  
int fun(int low, int high, char *str, int length){  
    if(length==0||length==1)
		return 1;  
    if(str[low]!= str[high] && str[low]!=str[high]+32 && str[low]!=str[high]-32)  
        return 0;  
    return fun(low+1, high-1, str, length-2);  
}  
int main(){  
    char *str=new char[100];
	cout<<"input the string:";
    gets(str);
    int length = strlen(str);  
    if(fun(0,length-1,str,length)){
        cout<<"Palindrome."<<endl;
    }else{
		cout<<"Not Palindrome."<<endl;
	}
    return 0;  
}  

采用递归实现.