判断素数 C C++两个版本

#include<stdio.h>
#include<math.h>
int judge(int num) 
{
	int i;
	if(num<2)
	return 0;
	for(i=2;i<=sqrt(num);i++)
	if(num%i==0)
	break;
	if(i>sqrt(num))
	return 1;
	return 0;
} 
int main()
{
	int num;
	scanf("%d",&num);
	if(judge(num)==0)
	printf("NOT");
	else
	printf("YES");
}

#include<iostream>
#include<cmath>
using namespace std;
int judge(int num) 
{
	int i;
	if(num<2)
	return 0;
	for(i=2;i<=sqrt(num);i++)
	if(num%i==0)
	break;
	if(i>sqrt(num))
	return 1;
	return 0;
} 
int main()
{
	int num;
	cin>>num;
	if(judge(num)==0)
	cout<<"NOT";
	else
	cout<<"YES";
}