/*
 * evenorodd.c
 * Selftest Problem5
 * Chapter 6
 * John Stile
 * Purpose:  Write a program named evenorodd.c that reads an integer
 *   and determines and prints if the number  is even or odd.
 *   Display an error message when a float is entered instead of an integer.
 */
#include <stdio.h>

int main(void)
{
  float read; // declare float variable read

  printf(" Enter an integer: ");
  
  scanf("%f", &read); // read from stdin,
                      // interpret as a float
                      // store at address location of var read

  getchar(); // clear stdin

  if ( (int)read != read ) // cast read to an int
                           // compare the result with the original
  {  
    printf("That is not an integer: %f\n", read );
  }
  else if( read == 0 )
  {
    printf("Zero is not even or odd. it's zero\n");
  }
  else
  {
    if ( read == ( 2* ( (int)read/2) ) ) // cast read to int
                                         // divide int read by 2
                                         // multiply result by 2
                                         // does result equal origninal 
    {  
      printf("The number %d is even\n", read);
    }
    else
    {
      printf("The nubmer %d is odd\n", read);
    }
  }
  return 0;
}