int main(void)
{
  int x=0, y=10, w=20, z, T=1, F=0;

  z = (x == 0);  /*  logical operator; result --> 0 or 1 */
  z = (x = 0);  /*  assignment operator; result -->   */
  z = (x == 1);
  z = (x = 15);
  z = (x != 2);
  z = (x < 10);
  z = (x <= 50);
  z = ((x=y) < 10); /*performs assignment, compares  with 10*/ 
  z = (x==5 && y<15);
  z = (x==0 && y>5 && w==10);
  z = (x==0 || y>5 && w==20);

  z = (T && T && F && x && x);  /***  ==> F; ***/
  z = (F || T || x || x);       /***  ==> T; ***/
  /***  for && and ||, order is specified,
        stops when result is known,  ***/
  /***  value of x doesn't matter  ***/
  return 0;
}