#include <stdio.h>

int main()
{
    int n, reversedInteger = 0, remainder, originalInteger;

    printf("输入一个整数: ");
    scanf("%d", &n);

    originalInteger = n;

    // 翻转
    while( n!=0 )
    {
        remainder = n%10;
        reversedInteger = reversedInteger*10 + remainder;
        n /= 10;
    }

    // 判断
    if (originalInteger == reversedInteger)
        printf("%d 是回文数。", originalInteger);
    else
        printf("%d 不是回文数。", originalInteger);

    return 0;
}

输入一个整数: 12321
12321 是回文数