wparentheses-1.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

/* Copyright (C) 2001 Free Software Foundation, Inc.  */

/* { dg-do compile } */
/* { dg-options -Wparentheses } */

/* Source: Neil Booth, 1 Nov 2001.  PR 3170, 3422 - bogus warnings
   about suggesting parentheses.  */

int foo (int a, int b)
{
  int c = (a && b) || 0;	/* { dg-bogus "suggest parentheses" }  */
  c = a && b || 0;		/* { dg-warning "suggest parentheses" }  */

  return (a && b && 1) || 0;	/* { dg-bogus "suggest parentheses" }  */
}