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  1. #include <cstdlib>
  2. #include <iostream>
  3.  
  4. using namespace std;
  5.  
  6. bool isPrime(int prime);
  7. int main(int argc, char *argv[])
  8. {   
  9.     int prime;
  10.     cout << "Enter an integer: ";
  11.     cin >> prime;
  12.     //bool isPrime(prime);
  13.     if (isPrime(prime)) {
  14.        cout << prime << " is a prime number." << endl;
  15. }
  16.     else {
  17.          cout << prime << " is not a prime number." << endl;
  18.          }
  19.     //system("PAUSE");
  20.     return EXIT_SUCCESS;
  21. }
  22. bool isPrime(int prime){
  23.     for (int divisor = 2; divisor <=prime/2; divisor++) {
  24.         if (prime%divisor==0)
  25.         return 0;
  26.            }
  27.            return true;
  28.         }
Success #stdin #stdout 0s 3344KB
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stdin
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12
stdout
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Enter an integer: 12 is not a prime number.
https://ideone.com/TxOyKu
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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