Question

write a function to check whether the number entered by a user is a prime number

Answer 1

#include <iostream>bool isPrime(int n) {    if ( n <= 1 ) {        return false;    }    for ( int i = 2; i <= n / 2; i++ ) {        if ( n % i == 0 ) {            return false;        }    }        return true;}int main() {    int number, input;    while ( true ) {        std::cout << "Please enter the number to be checked for being prime" << std::endl;        std::cin >> number;                if ( isPrime(number) )  {            std::cout << "Prime" <<std::endl;        } else  {            std::cout << "Not prime" << std::endl;        }        std::cout << "Another check? 0 for no" << std::endl;        std::cin >> input;        if (! input ) {            break;        }    }}