c language: palindrome number, 5-digit judgment

#include <stdio.h>
#include<string.h>

int main()
{
    char str[5];
    printf("请输入五位数:");
    scanf("%s",str);

    if(str[0]==str[4]&&str[1]==str[3])
        printf("这是一个回文数。\n");
    else
        printf("这不是回文数。\n");
    return 0;
}

If you have any questions, please comment below and I will answer them for you .