Question

Write a C++ program to accept an integer number and test whether it is prime or not.

Answer 1

#include <iostream.h>

void main() {
  int prime, C = 0;
  cout << "Enter the number";
  cin >> prime;
  for (int i = 2; i < prime; i++) {
    if (prime % i == 0)
      C = 1;
  }
  if (C == 0)
    cout << "The number" << prime << "is prime number";
  else
    cout << "The number" << prime << "is not a prime number";
  getch();
}