Question

c语言编程，大神求解，谢谢！

Answer 1

#include <stdio.h>
//#include "stdlib.h"
int main(void)
{
     int d[4],n;
     int i,j,t,max,min,k,num;
     printf("Input an integer:");
     scanf("%d",&n);
     num=0;     
     do   
     {
       d[2]=n%10;
        d[1]=(n/10)%10;
        d[0]=(n/100);
        if(d[0]==d[1] && d[1]==d[2])
        {
            printf("Input ERROR !");
            return 0;
        }
        //按位降序，并求出最大数和最小数
        max=0;
        min=0;
        k=1;
        for(i=0;i<=2;i++)
        {
            for(j=2;j>i;j--)
            {
                if(d[j]>d[j-1])
                {
                    t=d[j];d[j]=d[j-1];d[j-1]=t;
                }
            }
            max=max*10+d[i];
            min=min+d[i]*k;
            k=k*10;
        }
        n=max-min;
        printf("%d-%d=%d\n",max,min,n);
        //system("pause");
       num+=1;
     }while(n!=495);
    printf("number:%d",num);
    return 0;
}