Date: Fri, 29 Jan 1999 12:49:41 -0500
Message-Id: <199901291749.MAA15266@envy.delorie.com>
From: DJ Delorie <dj AT delorie DOT com>
To: djgpp AT delorie DOT com
In-reply-to: <36B1EDB5.53C1FDCB@net4you.co.at> (message from Seawolf on Fri,
	29 Jan 1999 18:19:49 +0100)
Subject: Re: Bitshifting
References:  <36B1EDB5 DOT 53C1FDCB AT net4you DOT co DOT at>
Reply-To: djgpp AT delorie DOT com


> int value = 0x000F;
> unsigned long c;
> 
> c = value + (value<<8) + (value<<16) + (value<<24);

Try this:

  c = value + (value<<8) + ((unsigned long)value<<16) + ((unsigned long)value<<24L);

The expressions aren't promoted until after the shifts (at the time of
the assignment), but by then it's too late.  You need to promote them
before the shifts.