This is not a bug.
In the man page of the isdigit:
These functions check whether c, which must have the value of an
unsigned char or EOF, falls into a certain character class according
to the current locale.
You should first test your value with a isascii if using isdigit.
Your code has a major memory overflow risk:
scanf("%d", &devisor);
1) Your test is wrong:
while(isdigit(devisor)); does not do what you think.
When you are giving it 21, it takes that code and says : the ASCII
code 22 is not a digital value in the ASCII table.
2) scanf is really a dangerous function, because of this overflow
issue, bad error handling.
- better is scanf with a %s in a buffer that you parse
afterwards with strtol for example (good for error testing)
- even better, fgets which allows to minimize the bugs of your
code by allowing error management.
Jc
On Thu, Jul 2, 2009 at 1:55 AM, vartan<vartan...@att.net> wrote:
> dear maintainer:
> the fallowing is a small sample of the code that contains all the info
> to reproduce the problem.
> the C library function isdigit() fails and causes segmention fault when
> the input is is not numeric like xx.
>
> COMPILE COMMAND : >> gcc -ansi --version -Wall -o ch2-13.out -lm
> ch2-13.c
> gcc (Debian 4.3.2-1.1) 4.3.2
> Copyright (C) 2008 Free Software Foundation, Inc
>
