check prime number.cpp

#include <iostream>

using namespace std;

int main() {

 int n;

 bool isPrime = true;

 cout << "Enter a positive integer: ";

 cin >> n;

 if (n <= 1) {

 isPrime = false;

 } else {

 for (int i = 2; i <= n / 2; ++i) {

 if (n % i == 0) {

 isPrime = false;

 break;

 }

 }

 }

 if (isPrime)

 cout << n << " is a prime number." << endl;

 else

 cout << n << " is not a prime number." << endl;

 return 0;