用于进行gcc测试

				/* Copyright (C) 2000 Free Software Foundation, Inc.  */								/* { dg-do preprocess } */								/* Test the various unary operators.  */								#if 1 + + + 1   /* allow multiple unary sign operators :) */				#endif								#if 8 - +3 != +4 + +1				#error		/* { dg-bogus "error" "unary +" } */				#endif								#if -2 - -1 != -1				#error		/* { dg-bogus "error" "unary -" } */				#endif								#if ~0 != -1				#error		/* { dg-bogus "error" "unary ~" } */				#endif								#if !0 && (!1 == 0) && !!1 != 1				#error		/* { dg-bogus "error" "unary !" } */				#endif								#if ~~8 != 8				#error		/* { dg-bogus "error" "double unary ~" } */				#endif								#if 5 + +!-4 != 5				#error		/* { dg-bogus "error" "compound unary +, !, -" } */				#endif