# include <stdio.h>

int main(void)
{
    int val; //存放待判断的数字；
    int m;
    int sum = 0;
    printf ("请您输入您想要判断的数字！\n");
    scanf ("%d", &val);
        m = val;
    while (m)
    {
        sum = sum*10+sum%10;
             m/=10;
    }
    if (sum == val)
        printf ("yes!\n");
    else
        printf ("no!\n");

    return 0;
}

不对，不过稍作修改就对了。
# include <stdio.h>

int main(void)
{
    int val; //存放待判断的数字；
    int m;
    int sum = 0;
    printf ("请您输入您想要判断的数字！\n");
    scanf ("%d", &val);
        m = val;
    while (m)
    {
        sum = sum*10+m%10;    //           这原来是sum不正确，改成m就对了
             m/=10;
    }
    if (sum == val)
        printf ("yes!\n");
    else
        printf ("no!\n");

    return 0;
}
搜

顶