Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.c > #56976

Re: what is data type 'int *' ?

Show all headers | View raw

On 02/04/2015 08:24 PM, glen herrmannsfeldt wrote:
...
> If (int) and (int*) are the same size, and passed to functions
> the same way, it usually works.  As machines with pointer and int
> of different size became more popular, there was more need for
> the message.
> 
> Note that you can cast to (int) and print with %i or %x. The 
> conversion is system dependent, but sometimes people know what
> it does on the specific system, and find it useful. 

It's not merely system dependent: "If the result cannot be represented
in the integer type, the behavior is undefined. The result need not be
in the range of values of any integer type." (6.3.2.3p6)

Don't do that. The right way to print pointer values is with "%p" and a
cast to void*.
-- 
James Kuyper

Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

what is data type 'int  *' ? bilsch <king621@comcast.net> - 2015-02-04 23:45 +0000
  Re: what is data type 'int  *' ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-02-05 00:09 +0000
    Re: what is data type 'int  *' ? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-02-05 01:24 +0000
      Re: what is data type 'int  *' ? James Kuyper <jameskuyper@verizon.net> - 2015-02-05 07:00 -0500
        Re: what is data type 'int  *' ? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-02-05 14:09 +0000
          Re: what is data type 'int  *' ? Robert Wessel <robertwessel2@yahoo.com> - 2015-02-05 13:08 -0600
            Re: what is data type 'int  *' ? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-02-06 00:33 +0000
              Re: what is data type 'int  *' ? Robert Wessel <robertwessel2@yahoo.com> - 2015-02-05 19:30 -0600
                Re: what is data type 'int  *' ? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-02-06 10:17 +0000
                Re: what is data type 'int  *' ? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-02-07 13:21 -0800
  Re: what is data type 'int  *' ? Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2015-02-04 19:47 -0500
    Re: what is data type 'int  *' ? bilsch <king621@comcast.net> - 2015-02-05 09:40 +0000
      Re: what is data type 'int  *' ? Richard Heathfield <rjh@cpax.org.uk> - 2015-02-05 09:51 +0000
    Re: what is data type 'int  *' ? Keith Thompson <kst-u@mib.org> - 2015-02-05 08:04 -0800
      Re: what is data type 'int  *' ? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-02-06 00:42 +0000
        Re: what is data type 'int  *' ? Keith Thompson <kst-u@mib.org> - 2015-02-05 19:09 -0800
  Re: what is data type 'int  *' ? Kaz Kylheku <kaz@kylheku.com> - 2015-02-05 01:17 +0000
  Re: what is data type 'int  *' ? Richard Heathfield <rjh@cpax.org.uk> - 2015-02-05 03:04 +0000
    Re: what is data type 'int  *' ? Richard Heathfield <rjh@cpax.org.uk> - 2015-02-05 03:06 +0000
  Re: what is data type 'int  *' ? Richard Heathfield <rjh@cpax.org.uk> - 2015-02-05 03:06 +0000
    Re: what is data type 'int  *' ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-02-05 10:20 +0000
      Re: what is data type 'int  *' ? Richard Heathfield <rjh@cpax.org.uk> - 2015-02-05 10:47 +0000
        Re: what is data type 'int  *' ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-02-05 12:18 +0000
          Re: what is data type 'int  *' ? Richard Heathfield <rjh@cpax.org.uk> - 2015-02-05 12:40 +0000
      Re: what is data type 'int  *' ? Keith Thompson <kst-u@mib.org> - 2015-02-05 08:24 -0800
        Re: what is data type 'int  *' ? James Kuyper <jameskuyper@verizon.net> - 2015-02-05 11:42 -0500
        Re: what is data type 'int  *' ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-02-05 17:13 +0000
    Re: what is data type 'int  *' ? Keith Thompson <kst-u@mib.org> - 2015-02-05 08:43 -0800
  Re: what is data type 'int  *' ? bilsch <king621@comcast.net> - 2015-02-05 09:45 +0000
  THANKS FOR THE INFO bilsch <king621@comcast.net> - 2015-02-05 09:47 +0000

csiph-web