# include <stdio.h>

void prime_check ( int n );

int main ( )
{
  int a;
  int b;
  int c;
  int d;
  int e[3] = { 12, 24, 36 };
  float f;
//
//  You can send in an integer constant.
//
  prime_check ( 23 );
//
//  You can send in a variable.
//
  a = 33;
  prime_check ( a );
//
//  You can send in one entry of an array.
//
  prime_check ( e[2] );
//
//  What happens if you give the function bad input?
//
  b = - 13;
  prime_check ( b );

  c = 0;
  prime_check ( c );

  d = 1;
  prime_check ( d );
//
//  What happens if you send in data of the wrong type?
//
  f = 19.3;
  prime_check ( f );

  return 0;
}

void prime_check ( int n )
{
  int i;
  printf ( "N = %i\n", n );
  for ( i = 2; i < n; i++ )
  {
    if ( n % i == 0 )
    {
      printf ( "%i is not a prime number, it is divisible by %i.\n", n, i );
      return;
    }
  }
  printf ( "%i is a prime number.\n", n );

  return;
}