From: "John M. Aldrich" <fighteer AT cs DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: problem with islower() in DJGPP
Date: Fri, 17 Apr 1998 19:15:04 -0400
Organization: Two pounds of chaos and a pinch of salt.
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Atram Schultz wrote:
> 
> Hi,
> 
> I'm a beginner to C++ and I'm testing a very small program with the
> islower()
> function.  For some reason, this function is returning zero whether I input
> a capital
> or a non-capital.  Here's the program:

Why don't you use tolower() instead of islower()?  The latter tests
whether the value is lowercase or not.

There are other bugs in your code; here's a fixed version:

#include <iostream.h>
#include <ctype.h>

int main( void )  // main must return int
{
  char a;
  int x;

  cout << "Input a character: ";
  cin >> a;
  x = tolower(a);
  cout << char(x) << endl;  // cast to char for correct display
                            // put endl _after_ output, not before

  return 0;
}


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