C语言程序设计教程（第三版）课后习题5.7 （C语言代码）

解题思路:

注意事项:

参考代码:

#include<stdio.h>

int main (void)

{

    int a;

    int b = 0;

    int ch[5] = {0,0,0,0,0};

    int n,n1;

    int x = 0;

    scanf("%d",&a);

    for(n = 1;n/a<=1;n*=10)

       {

            b+=1;

        }

    printf("%d\n",b);

    n/=10;

    while(a>=10)

    {

        ch[x] = a/n;

        a -= ch[x]*n;

        n/=10;

        x+=1;

        while(a/n*10<=1&&a!=0)

        {

            ch[x] = 0;

            x++;

            n/=10;

        }

    }    

    ch[x] = a;

    n1 = 0;

    while(n1<x)

    {

        printf("%d",ch[n1]);

        printf(" ");

        n1+=1;

    }

    printf("%d\n",ch[n1]);

    while(n1>=0)

    {

        printf("%d",ch[n1]);

        n1--;

    }

    return 0;

}