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Re: isspace() executes without ctype header?

From Lew Pitcher <lew.pitcher@digitalfreehold.ca>
Newsgroups comp.lang.c
Subject Re: isspace() executes without ctype header?
Followup-To comp.lang.c
Date 2017-06-13 21:49 -0400
Organization The Pitcher Digital Freehold
Message-ID <ohq4gs$bf6$1@dont-email.me> (permalink)
References <ohq29k$892$1@dont-email.me>

Followups directed to: comp.lang.c

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DFS wrote:

> Seems strange, but the code compiles (Tiny C on Windows) and runs just
> fine with only stdio.h and stdlib.h includes.
> 
> Online resources say ctype.h is the required header (which I didn't know
> obviously).
> 
> I compiled the program with Pelles and got warnings:
> 
> Undeclared function 'isspace' (did you mean 'vsscanf'?); assuming
> 'extern' returning 'int'.
> 
> 
> Why is it working without ctype.h?

Because your compiler guessed correctly about the parameter types that the 
function takes, and the type of the value the function returns.

It likely took your word for the parameter types, though (based on how you 
invoked the function).

-- 
Lew Pitcher
"In Skills, We Trust"
PGP public key available upon request

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isspace() executes without ctype header? DFS <nospam@dfs.com> - 2017-06-13 21:13 -0400
  Re: isspace() executes without ctype header? Ian Collins <ian-news@hotmail.com> - 2017-06-14 13:20 +1200
    Re: isspace() executes without ctype header? DFS <nospam@dfs.com> - 2017-06-13 21:33 -0400
      Re: isspace() executes without ctype header? Ian Collins <ian-news@hotmail.com> - 2017-06-14 13:35 +1200
        Re: isspace() executes without ctype header? DFS <nospam@dfs.com> - 2017-06-13 22:31 -0400
          Re: isspace() executes without ctype header? Ian Collins <ian-news@hotmail.com> - 2017-06-14 14:40 +1200
  Re: isspace() executes without ctype header? Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2017-06-13 21:49 -0400
  Re: isspace() executes without ctype header? Tim Rentsch <txr@alumni.caltech.edu> - 2017-06-13 19:20 -0700
    Re: isspace() executes without ctype header? DFS <nospam@dfs.com> - 2017-06-13 23:04 -0400
      Re: isspace() executes without ctype header? asetofsymbols@gmail.com - 2017-06-13 23:07 -0700
      Re: isspace() executes without ctype header? Tim Rentsch <txr@alumni.caltech.edu> - 2017-06-14 08:26 -0700
        Re: isspace() executes without ctype header? bartc <bc@freeuk.com> - 2017-06-14 17:29 +0100
          Re: isspace() executes without ctype header? Keith Thompson <kst-u@mib.org> - 2017-06-14 09:46 -0700
            Re: isspace() executes without ctype header? bartc <bc@freeuk.com> - 2017-06-14 17:54 +0100
              Re: isspace() executes without ctype header? Keith Thompson <kst-u@mib.org> - 2017-06-14 10:17 -0700
              Re: isspace() executes without ctype header? supercat@casperkitty.com - 2017-06-14 10:48 -0700
                Re: isspace() executes without ctype header? Keith Thompson <kst-u@mib.org> - 2017-06-14 12:03 -0700
                Re: isspace() executes without ctype header? supercat@casperkitty.com - 2017-06-14 12:48 -0700
                Re: isspace() executes without ctype header? Keith Thompson <kst-u@mib.org> - 2017-06-14 13:06 -0700
            Re: isspace() executes without ctype header? Tim Rentsch <txr@alumni.caltech.edu> - 2017-06-16 23:14 -0700
  Re: isspace() executes without ctype header? bartc <bc@freeuk.com> - 2017-06-14 11:18 +0100
    Re: isspace() executes without ctype header? Keith Thompson <kst-u@mib.org> - 2017-06-14 09:35 -0700
      Re: isspace() executes without ctype header? bartc <bc@freeuk.com> - 2017-06-14 17:47 +0100
        Re: isspace() executes without ctype header? supercat@casperkitty.com - 2017-06-14 10:19 -0700
          Re: isspace() executes without ctype header? Keith Thompson <kst-u@mib.org> - 2017-06-14 10:29 -0700
        Re: isspace() executes without ctype header? Keith Thompson <kst-u@mib.org> - 2017-06-14 10:21 -0700
          Re: isspace() executes without ctype header? bartc <bc@freeuk.com> - 2017-06-14 19:12 +0100
            Re: isspace() executes without ctype header? Keith Thompson <kst-u@mib.org> - 2017-06-14 12:12 -0700
            Re: isspace() executes without ctype header? joel.rees@gmail.com - 2017-06-16 17:56 -0700
              Re: isspace() executes without ctype header? supercat@casperkitty.com - 2017-06-17 10:20 -0700
                Re: isspace() executes without ctype header? Robert Wessel <robertwessel2@yahoo.com> - 2017-06-18 00:25 -0500
                Re: isspace() executes without ctype header? supercat@casperkitty.com - 2017-06-19 09:01 -0700
                Re: isspace() executes without ctype header? Robert Wessel <robertwessel2@yahoo.com> - 2017-06-19 21:59 -0500

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