指针与字符串小测验

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#include <cstdio>
#include <cstring>

void Swap(char &a, char &b){
    char temp;
    temp=a;
    a=b;
    b=temp;
}

void work(char *str){
    int len=strlen(str);
    for (int  i = 0; i < len/2; i++)    {
        Swap(str[i],str[len-i-1]);
    }    
}

int main (){
    char s[100];
    char *str=s;
    gets(s);  //  gets function reads a line from stdin and stores it into the string 
    work(str);
    printf("%s",s);
    return 0;
}