KT So Nguyen To

#include <iostream>
using namespace std;
int ktsonguyento(int &n)
{
	int dem = 0;
	cout << "nhap so duong kiem tra = ";
	cin >> n;
	if (n < 2)
	{
		cout << "dieu kien khong hop le";
	}
	for (int i = 2; i <= sqrt(n); i++)
	{
		if (n%i == 0)
		{
			dem++;
		}
	}
	if (dem == 0)
		return true;
	else
		return false;

}
void main()
{
	int n;
	if (ktsonguyento(n) == true)
		cout << n << " la so nguyen to";
	else
		cout << n << "khong phai la so nguyen to";
	system("pause");
}