Subj : Re: possible overflow?
To   : comp.programming
From : Rob Somers
Date : Fri Aug 26 2005 07:05 pm

Peter Nilsson wrote:

>     while (mask != 0)
>     {
>       putchar('0' + !!(input & mask));
>       mask >>= 1;
>     }

Ok, the double negation operation is a little hazy in my mind.  I was going
to try and explain what I thought it is doing, but that seems to not be
working.  I was able to turn up something regarding the double '!!' which 
Dan Pop wrote on comp.lang.c, but his explanation was brief.  Would someone
care to explain what is happening with 

putchar('0' + !!(input & mask));   

and how it works?

Rob Somers

.