#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int main()
{
    int num;char b[6];
    while(1)
    {
        do
        {
            printf("input a num  among 0-99999\n");
            scanf("%d",&num);
        }while(num<0||num>99999);
        itoa(num,b,10);
        puts(b);
        printf("\n");
        int i,count=0;
        for(i=0;b[i];i++)
        {
            printf("%c\t",b[i]);
            count++;
        }
        printf("\n%d bit\n",count);
    }
}
楼上的用itoa，确实方便啊。