验证歌德巴赫猜想

#include<iostream>
#include<cmath>
using namespace std;
int sushu(int x)
{	int i=2;
	while((i<=floor(sqrt(x)))&&(x%i!=0))
	i++;
	if(i>floor(sqrt(x)))
	return true;
	else return false;}	
int main()	
{int n;
	cin>>n;
	for(int j=2;j<=n/2;j++)
	if(sushu(j)==1&&sushu(n-j)==1)
	cout<<n<<" "<<"="<<" "<<j<<" "<<"+"<<" "<<(n-j)<<endl;
	return 0;
	}