Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!xylogics!transfer!crackers!m2c!wpi.WPI.EDU!profesor
From: profesor@wpi.WPI.EDU (Matthew E Cross)
Newsgroups: comp.lang.c
Subject: Re: Is there a good example of how toupper() works?
Message-ID: <1990Oct17.170914.683@wpi.WPI.EDU>
Date: 17 Oct 90 17:09:14 GMT
References: <2466@ux.acs.umn.edu> <wb76pN600awOE3SaQz@andrew.cmu.edu>
Organization: Worcester Polytechnic Institute
Lines: 24

In article <wb76pN600awOE3SaQz@andrew.cmu.edu> jh4o+@andrew.cmu.edu (Jeffrey T. Hutzelman) writes:
>Try this one:
>
>void strupper(char *str)
>{
>for (;*str!='\0';str++)
>	*str=toupper(*str);
>}

Nope, won't work - the return value of 'toupper' is undefined if the input is
not a lowercase character.  Try:

void strupper(char *str)
{
for (;*str!='\0';str++)
       *str=islower(*str)?toupper(*str):*str;
}

(I hope I got the '? :' syntax right...)
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