6174问题

<pre name="code" class="cpp">#include<stdio.h>
#include<string.h>
int num[200],count;
int Get(int x)
{
  int a,i,b,n;
  char s[10];
  sprintf(s,"%d",x);    //将数字以字符串的形式保存到字符s中；
 n=strlen(s);
 for (i=0;i<n;i++)
   for (int j=i+1;j<n;j++)
   if (s[i]>s[j])
   {
   char t=s[i];s[i]=s[j];s[j]=t;
   }
   sscanf(s,"%d",&b);
   for (i=0;i<n/2;i++)
   {
   char t=s[i];s[i]=s[n-1-i];s[n-1-i]=t;
   }
   sscanf(s,"%d",&a);            //字符反转，将字符以数字的形式保存到a中；
   return a-b;
}
int main()
{
   scanf("%d",&num[0]);    //输入一个四位数
   printf("%d",num[0]);
  count=1;
  for (;;)
  {
    num[count]=Get(num[count-1]);
	printf("->%d",num[count]);
  int found=0;
  for (int i=0;i<count;i++)
    if (num[i]==num[count])
	{
	   found=1;
	   break;
	}
 if (found)
	 break;
     count++;
  }
  printf("\n");
 return 0;
}