Newsgroups: comp.os.msdos.djgpp
Subject: Re: if(a==0xff) warning
From: richard AT stardate DOT ca (Richard Sanders)
X-Newsreader: WinVN 0.99.9 (Released Version) (x86 32bit)
References: <9l1dan$nq3$01$1 AT news DOT t-online DOT com> <3B748D9A DOT 5030708 AT operamail DOT com>
MIME-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
NNTP-Posting-Host: wlp47.rapidnet.net
Message-ID: <3b749d12_2@rapidnet.net>
Date: 10 Aug 2001 19:48:50 -0700
X-Trace: binaries.vphos.net 997498130 wlp47.rapidnet.net (10 Aug 2001 19:48:50 -0700)
Organization: Rapidnet Internet
Lines: 19
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

>> char a;
>> 
>> a=0xff;
>> 
>> if(a==0xff)foo();
>> 
>> 
>> C:\>gcc foo.cpp -o foo.exe
>> foo.cpp: In function `void main()':
>> foo.cpp:598: warning: comparison is always false due to limited rang
>e of
>> data
>> type
>> 
>0xff=255, the limits of the char type is -127 - 127 so you can see how

So use unsigned char a; 0 -> 255