Removing "if (a = b)" warning

[Stephen]

Re: Removing "if (a = b)" warning

In article <43617937.7CED@ mindspring.com> , pete <pfiland@mindsp ring.com>
writes[color=blue]
>Martin Ambuhl wrote:[color=green]
>>
>> Stephen wrote:[color=darkred]
>> > Is there a standard way to remove
>> > the warning that a C compiler might
>> > produce from the statement:
>> >
>> > if (a = b) {}
>> >
>> > I don't want to do:
>> >
>> > if ((a = b) != 0) {}[/color][/color][/color]
[color=blue]
> if (A)
>means exactly the same thing as
> if ((A) != 0)
>
>for any and all possible meanings of A, including funky macros.[/color]

You've missed the point:

if ((a = b) != 0)

will kill the warning generated by:

if (a = b)

[Peter Nilsson]

Re: Removing &quot;if (a = b)&quot; warning

Ben Pfaff wrote:[color=blue]
> pete <pfiland@mindsp ring.com> writes:[color=green]
> > if (A)
> > means exactly the same thing as
> > if ((A) != 0)
> >
> > for any and all possible meanings of A, including funky macros.[/color]
>
> Here's an interesting funky macro to go along with that
> observation:
> #define if(expr) if ((expr) != 0)
> (Does it break anything?)[/color]

It can if you include a standard header after the macro
definition. Also, if A is an expression that includes a non-
parenthesised comma, then there is a problem since the macro
only takes one parameter.

--
Peter

[pete]

Re: Removing &quot;if (a = b)&quot; warning

Stephen wrote:[color=blue]
>
> In article <43617937.7CED@ mindspring.com> , pete <pfiland@mindsp ring.com>
> writes[color=green]
> >Martin Ambuhl wrote:[color=darkred]
> >>
> >> Stephen wrote:
> >> > Is there a standard way to remove
> >> > the warning that a C compiler might
> >> > produce from the statement:
> >> >
> >> > if (a = b) {}
> >> >
> >> > I don't want to do:
> >> >
> >> > if ((a = b) != 0) {}[/color][/color]
>[color=green]
> > if (A)
> >means exactly the same thing as
> > if ((A) != 0)
> >
> >for any and all possible meanings of A, including funky macros.[/color]
>
> You've missed the point:[/color]

That happens more often than I like.
[color=blue]
> if ((a = b) != 0)
>
> will kill the warning generated by:
>
> if (a = b)[/color]

I thought that you wanted to kill the warning.

if ((a = b) != 0) {}
kills the warning very nicely
without changing the meaning of the code.

--
pete