字符串反向输出

#include<stdio.h>#include<string.h>#define N 100int main(){    char a[N], b[N];    int len, i = 0;    scanf("%s", a);    len = strlen(a);    b[len] = '\0';    while(len--)    {        b[i] = a[len];        i++;    }    printf("%s\n", b);    return 0;}