#include<stdio.h>
#include<stdlib.h>
#include<math.h>
void main()
{
 int a,d,flag=0;
 float b,c;
loop:
 {
  printf("请输入一个偶数：\n");
  scanf("%d",&a);
 }
 if(a%2!=0)
  goto loop;
 for(b=2;b<=a/2;b++)
 {
  for(d=2;d<=sqrt(b);d++)
   if((int)b%d==0)
    break;
  if (d>sqrt(b))
   c=a-b;
  else continue;
  for(d=2;d<=sqrt(c);d++)
   if((int)c%d==0)
    break;
  if (d>sqrt(c))
  {
   printf("%d = %d + %d\n",a,(int)b,(int)c);
   flag=1;
  }
  else continue;
 }
 if((int)flag==0)
  printf("不能拆分\n");
 system("pause");
}