[cfe-dev] why is such a code allowed?

[James Molloy]

Hi Guy,

C89 doesn't have the concept of "bool" - all comparisons return an int (or
is it an unsigned int?) in the range [0,1].

C99 and C++ build on C89 so even though they have the concept of "bool",
the type of a comparison was not changed.

Cheers,

James

[Even though this C-language question seems easy enough for me to answer, I
am certain that a true language lawyer will pipe up and tell me I'm wrong
;) ]

On Fri Feb 06 2015 at 4:37:11 PM Guy Maurel <guy.maurel at kde.org> wrote:

> Hello!
>
> Let say:
>     int a = 5;
>     int b = 7;
>     int i = 20;
>     if ((a  == b) + i) {
>         a = 15;
>     }
> My question is:
> The expression (a == b) gives a bool result.
> Why is it allowed to add a "bool" and an "int".
>
> Thanks
> --
> Guy Maurel
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>
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