题目：一个5位数，判断它是不是回文数。即12321是回文数，个位与万位相同，十位与千位相同。　　　

程序:

#include <stdio.h>

int main(void)

{

int a,b,c,d;

long s;

printf("Please enter a number:");

scanf("%ld",&s);

if(s <= 99999&&s >= 10000)

{

a=s/10000;

    b=s/1000%10;

    c=s/10%10;

    d=s%10;

    if ( a ==d && b == c )

    printf("%d is a huiwen number.\n",s);

    else

    printf("%d is not a huiwen number.\n",s);

    }

    else

    printf("it is not a correct number.\n");

return 0;

}

输出样例:

图片发自简书App