From:	Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: checking int
Date:	Tue, 14 Mar 2000 19:04:00 +0200
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Florent wrote:
> 
> Hi,
> I don't find the way to check if the input I give to the function scanf is
> an int or a char. For example you ask to enter an int, and if a char is
> entered -> BUG, so I need something to check if tne input is an int.
> It's easy to check if it's a char, but int .... I didn't find.

One handy technique is to read the input as a character string, and then
convert it to an int by calling library function `strtol'.  This function
stops at the first non-numeric character and returns to you the pointer to
that character.  If the pointer doesn't point to the '\0' character which
terminates the string, you know that some of the input was not numeric.

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