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;
}