我刚刚自己编了一个，想百度看看别人怎么编的，结果论坛就有 这是我的
#include<stdio.h>
int main()
{
    int a,b,c,d,e,x,max;
    scanf("%d",&x);
    if(x>=10000&&x<99999)
    {
        max=5;
        a=x/10000;
        b=(x-10000*a)/1000;
        c=(x-a*10000-b*1000)/100;
        d=(x-a*10000-b*1000-c*100)/10;
        e=x%10;
        printf("5位数\n");
        printf("%d,%d,%d,%d,%d\n",a,b,c,d,e);
        printf("%d%d%d%d%d\n",e,d,c,b,a);
    }
    else if(x>=1000&&x<=9999)
        {
            max=4;
            e=x%10;
            b=x/1000;
            c=(x-b*1000)/100;
            d=(x-1000*b-100*c)/10;
            e=x%10;
            printf("4位数\n");
            printf("%d,%d,%d,%d\n",b,c,d,e);
            printf("%d%d%d%d\n",e,d,c,b);

        }
    else if(x>=100&&x<=999)
    {
        max=3;
        e=x%10;
        c=x/100;
        d=(x-c*100)/10;
        printf("三位数\n");

        printf("%d,%d,%d\n",c,d,e);
        printf("%d%d%d\n",e,d,c);

    }
    else if(x>=10&&x<=99)
    {
        max=2;
        e=x%10;
        d=x/10;
        printf("二位数\n");

        printf("%d,%d\n",d,e);
        printf("%d%d\n",e,d);

    }
        else
    {
        max=1;
        printf("一位数\n");
        printf("%d\n",x);
        printf("%d\n",x);
    }
        return 0;
}