#define M 100000
#include <stdio.h>
void main()
{
    long int i;
    int a,b,c,d,e,place;
    printf("请输入一个小于%d的正整数i:",M);
    scanf("%d",&i);
    while(i>M)
    {
        printf("不符合要求,请重新输入一个小于%d的正整数i:",M);
        scanf("%d",&i);
    }
    if(i>=10000)
        place=5;
    else if(i>=1000)
            place=4;
         else if(i>=100)
                place=3;
              else if(i>=10)
                    place=2;
                    else
                        place=1;
    printf("输入数的位数是：%d\n",place);
    printf("每位的数字为：");
    e=i/10000;
    d=(i-10000*e)/1000;
    c=(i-10000*e-1000*d)/100;
    b=(i-10000*e-1000*d-100*c)/10;
    a=(i-10000*e-1000*d-100*c-10*b)/1;
//    printf("%d%d%d%d%d",a,b,c,d,e);
    switch(place)
    {
        case 5:printf("%d %d %d %d %d",e,d,c,b,a);
                printf("\n反序数字为:");
                printf("%d %d %d %d %d",a,b,c,d,e);break;

        case 4:printf("%d %d %d %d",d,c,b,a);
                printf("\n反序数字为:");
                printf("%d %d %d %d",a,b,c,d);break;

        case 3:printf("%d %d %d",c,b,a);
                printf("\n反序数字为:");
                printf("%d %d %d",a,b,c);break;

        case 2:printf("%d %d",b,a);
                printf("\n反序数字为:");
                printf("%d %d",a,b);break;

        case 1:printf("%d",a);
                printf("\n反序数字为:");
                printf("%d",a);break;
        default:printf("enter data error!");
    }

}

这是嘛情况

你要说什么

#include<stdio.h>
int main()
{
    long int num,a[5],i,j;
    printf("Please enter a number between 1 and 99999\n");
    scanf("%d",&num);
    for(;num>=100000||num<=0;)
    {
        printf("Data error! Please enter the number between 1 and 99999\n");
        scanf("%d",&num);
    }
    for(i=0;i<5&&num>0;i++)
    {
        a[i]=num%10;
        num=num/10;
    }
    printf("输入number的位数为:%ld\n",i);
    printf("分别输出每一位数:");
    for(j=i-1;j>=0;j--)
    {
        printf("%ld ",a[j]);
    }
    printf("\n");
    printf("逆序输出每一位数:");
    for(j=0;j<i;j++)
    {
        printf("%ld ",a[j]);
    }
    printf("\n");
    return 0;
}