#include <iostream> using namespace std; bool isprime(int ); int main() { cout << "Hello World! \n "; int n; cout << "Enter a number : " << endl; cin >> n ; for(int i = 2 ; i <= n ; ++i) { if(isprime(i)) cout << i << endl ; } return 0; } bool isprime(int number) { for(int check = 2 ; check < number ; ++check) { if(number % check == 0) return false; } return true ; }