如何用if else写这个程序？

Question

Answer 1

效果及代码如下：

代码：

#include <stdio.h>
int main()
{
    int i,n,ws=0;
    int buf[5];
    scanf("%d",&n);
    if (n >= 10000)
    {
        ws = 5;
        buf[0] = n/10000;
        buf[1] = n%10000/1000;
        buf[2] = n%1000/100;
        buf[3] = n%100/10;
        buf[4] = n%10;
    }else if (n>= 1000)
    {
        ws = 4;
        buf[0] = n/1000;
        buf[1] = n%1000/100;
        buf[2] = n%100/10;
        buf[3] = n%10;
    }else if (n >= 100)
    {
        ws = 3;
        buf[0] = n/100;
        buf[1] = n%100/10;
        buf[2] = n%10;
    }else if (n >=10)
    {
        ws = 2;
        buf[0] = n/10;
        buf[1] = n%10;
    }else
    {
        ws = 1;
        buf[0] = n;
    }
    

    
    printf("位数：%d\n",ws);
    printf("逆序输出：");
    for(i=ws-1;i>=0;i--)
        printf("%d",buf[i]);
    return 0;
}