Path: utzoo!utgpu!water!watmath!clyde!att!rutgers!mailrus!ames!haven!umd5!gsmith
From: gsmith@umd5.umd.edu (Gordon Smith)
Newsgroups: comp.lang.c
Subject: Re: getch() and getche() in MSC 4.0
Keywords: *##%@^!&ing functions!
Message-ID: <4166@umd5.umd.edu>
Date: 24 Oct 88 01:56:30 GMT
References: <10508@dartvax.Dartmouth.EDU>
Reply-To: gsmith@umd5.umd.edu (Gordon Smith)
Distribution: comp.lang.c
Organization: University of Maryland, College Park
Lines: 18

In article <10508@dartvax.Dartmouth.EDU> jalphin@prism.clemson.edu writes:
>
>	[This article was written by Scott Horne, not Yaping Xu.
>
>Has anyone else had trouble with getch() and getche() in Microsoft C v. 4.0?
>They often skip every other keypress on me--and in one case, they skip two
>keypresses out of three!  Maybe it's my code.  This occurs mainly when I try
>
>	c = toupper(getch());
>

    The reason your program is not working correctly, is because of
the toupper, not the getch.  toupper() is implemented as a macro, not a 
function.  Therefore the code MAY look similiar to this:
	c = isalpha(getch()) && isupper(getch()) ? getch() : getch()-'a'+'A';

Therefore executing getch() more than once.  This may not be the exact
macro description for toupper, but it does illustrate the point.