/*
   File: side_effect.c

   This program demonstrates expressions
   with side effects and the fact that
   order of evaluation in a C expression
   is not predictable.

*/

#include <stdio.h>

main() {
   int n = 2  ;

   /* The following expression has no side-effects */
   1 * 2  + 3 / 4 - 5 - 6 + 7 - 8 ;
   printf("n = %d\n", n) ;

   /* The following expression has a side-effect */
   n = 5 - n ;
   printf("n = %d\n", n) ;

   /* The following expression has unpredictable 
      side-effects.  THIS IS BAD PROGRAMMING STYLE
   */

   n = (n = 10) * 4 + (n = n * 10) * 2 ;
   printf ("n = %d \n", n) ;

}