prime number c++
#include <iostream>
#include <cmath>
using namespace std;
bool isPrime(int num);
int main() {
int number;
cout << "Enter a positive integer: ";
cin >> number;
if (isPrime(number))
cout << number << " is a prime number." << endl;
else
cout << number << " is not a prime number." << endl;
return 0;
}
bool isPrime(int num) {
if (num <= 1)
return false;
for (int i = 2; i <= sqrt(num); ++i) {
if (num % i == 0)
return false;
}
return true;
}