Write a Program to Check the Prime Number

C++// C++ program to check if a // Number is prime #include <iostream> using namespace std; bool isPrime(int n) { // base condition if (n <= 1) return false; // Check from 2 to n-1 for (int i = 2; i < n; i++) if (n % i == 0) return false; return true; } int main() { isPrime(21) ? cout << " true\n" : cout << " false\n"; isPrime(17) ? cout << " true\n" : cout << " false\n"; return 0; }

Output

 false
 true