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Re: pass by address

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Ken Brody <kenbrody@spamcop.net> writes:

> On 5/5/2014 11:13 PM, Bill Cunningham wrote:
>> "Malcolm McLean" <malcolm.mclean5@btinternet.com>
>>
>> Why do you need to print out a pointer?
>>> I'm sure someone can think of a reason, but normally, only for debugging.
>>> If a program is behaving strangely, you might want to print out a few
>>> pointer values to see what they look like.
>>> So typically you'll insert a daignostic printf("%p\n", ptr), take a
>>> look at the problem, fix it, then delete the code.
>>
>>      In real life I can't think of why. But my tutorials that are no good
>> give me those examples. There  are certain things that you don't pick up out
>> of the tutorials I now have that you can't get except from those with
>> experience.
>
> I can think of tutorials having a good reason to want to display
> pointers. Consider explaining why "str1==str2" is not the same as
> "strcmp(str1,str2)".
>
> =====
> #define	MyString "Hello, world.\n"
> char foo1[] = MyString;
> char bar1[] = MyString;
> char *foo2 =  MyString;
> char *bar2 =  MyString;
> ...
> printf("foo1 is at address %p\nbar1 is at address %p\n",foo1,bar1);
> printf("foo2 points to %p\nbar2 points to %p\n",foo2,bar2);
> ....
> =====
>
>> The thing is I'm getting a little leary of the advice I'm
>> getting. It's like asking someone for directions and they point to the right
>> with the right arm and the left with the left arm and they don't seem to
>> understand what I just asked.
>
> Perhaps it's because you ask for directions with questions like "I'm trying to
> drive backwards down a one-way street, but I'm not sure which key fits the
> ignition -- can you tell me how to put gas in the tank?"
>
>

Gadzooks.

Or he's trolling...

-- 
"Avoid hyperbole at all costs, its the most destructive argument on
the planet" - Mark McIntyre in comp.lang.c

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pass by address "Bill Cunningham" <nosapm@nspam.invalid> - 2014-05-02 16:53 -0400
  Re: pass by address "Bill Cunningham" <nosapm@nspam.invalid> - 2014-05-02 17:03 -0400
    Re: pass by address "Bill Cunningham" <nosapm@nspam.invalid> - 2014-05-02 17:20 -0400
  Re: pass by address Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2014-05-02 17:58 -0400
    Re: pass by address "Bill Cunningham" <nosapm@nspam.invalid> - 2014-05-02 18:09 -0400
      Re: pass by address Barry Schwarz <schwarzb@dqel.com> - 2014-05-02 16:37 -0700
        Re: pass by address gazelle@shell.xmission.com (Kenny McCormack) - 2014-05-02 23:43 +0000
          Re: pass by address Richard <rgrdev_@gmail.com> - 2014-05-03 15:58 +0200
            Re: pass by address gazelle@shell.xmission.com (Kenny McCormack) - 2014-05-03 14:08 +0000
              Re: pass by address Barry Schwarz <schwarzb@dqel.com> - 2014-05-03 10:38 -0700
                Re: pass by address Richard <rgrdev_@gmail.com> - 2014-05-03 21:13 +0200
        Re: pass by address "Bill Cunningham" <nosapm@nspam.invalid> - 2014-05-03 01:46 -0400
        Re: pass by address "Bill Cunningaham" <nospam@nspam.invalid> - 2014-05-03 11:22 -0400
          Re: pass by address James Kuyper <jameskuyper@verizon.net> - 2014-05-03 12:13 -0400
          Re: pass by address Keith Thompson <kst-u@mib.org> - 2014-05-03 12:34 -0700
            Re: pass by address Richard <rgrdev_@gmail.com> - 2014-05-03 22:33 +0200
            Re: pass by address glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-05-03 21:21 +0000
              Re: pass by address "Bill Cunningham" <nospam@nspam.invalid> - 2014-05-04 00:08 -0400
                Re: pass by address Barry Schwarz <schwarzb@dqel.com> - 2014-05-03 21:52 -0700
                Re: pass by address Tonton Th <tth@nowhere.invalid> - 2014-05-04 08:44 +0000
                Re: pass by address Keith Thompson <kst-u@mib.org> - 2014-05-04 01:51 -0700
                Re: pass by address "Bill Cunningham" <nospam@nspam.invalid> - 2014-05-04 15:06 -0400
                Re: pass by address Barry Schwarz <schwarzb@dqel.com> - 2014-05-04 15:35 -0700
                Re: pass by address Richard <rgrdev_@gmail.com> - 2014-05-05 12:01 +0200
                Re: pass by address Barry Schwarz <schwarzb@dqel.com> - 2014-05-05 11:46 -0700
                Re: pass by address "Bill Cunningham" <nospam@nspam.invalid> - 2014-05-05 14:18 -0400
                Re: pass by address Barry Schwarz <schwarzb@dqel.com> - 2014-05-05 11:55 -0700
                Re: pass by address "Bill Cunningham" <nospam@nspam.invalid> - 2014-05-05 15:20 -0400
                Re: pass by address "Bill Cunningham" <nospam@nspam.invalid> - 2014-05-05 15:23 -0400
                Re: pass by address Ken Brody <kenbrody@spamcop.net> - 2014-05-06 11:02 -0400
                Re: pass by address "Bill Cunningham" <nospam@nspam.invalid> - 2014-05-06 14:46 -0400
                Re: pass by address Richard <rgrdev_@gmail.com> - 2014-05-05 12:00 +0200
                Re: pass by address Malcolm McLean <malcolm.mclean5@btinternet.com> - 2014-05-05 14:50 -0700
                Re: pass by address "Bill Cunningham" <nospam@nspam.invalid> - 2014-05-05 23:13 -0400
                Re: pass by address "Osmium" <r124c4u102@comcast.net> - 2014-05-05 23:09 -0500
                Re: pass by address "Bill Cunningham" <nospam@nspam.invalid> - 2014-05-06 08:55 -0400
                Re: pass by address Ken Brody <kenbrody@spamcop.net> - 2014-05-06 11:16 -0400
                Re: pass by address Richard <rgrdev_@gmail.com> - 2014-05-06 18:13 +0200
                Re: pass by address Kaz Kylheku <kaz@kylheku.com> - 2014-05-04 21:06 +0000
                Re: pass by address Kaz Kylheku <kaz@kylheku.com> - 2014-05-04 23:50 +0000
                Re: pass by address Keith Thompson <kst-u@mib.org> - 2014-05-04 12:36 -0700
                Re: pass by address "Bill Cunningham" <nospam@nspam.invalid> - 2014-05-05 14:21 -0400
                Re: pass by address Keith Thompson <kst-u@mib.org> - 2014-05-04 01:29 -0700
                Re: pass by address "Bill Cunningham" <nospam@nspam.invalid> - 2014-05-04 15:09 -0400
        Re: pass by address "Bill Cunningaham" <nospam@nspam.invalid> - 2014-05-03 11:32 -0400
  Re: pass by address Barry Schwarz <schwarzb@dqel.com> - 2014-05-02 16:43 -0700
    Re: pass by address "Bill Cunningham" <nosapm@nspam.invalid> - 2014-05-03 01:54 -0400
      Re: pass by address Richard <rgrdev_@gmail.com> - 2014-05-03 15:59 +0200
    Re: pass by address "Bill Cunningham" <nosapm@nspam.invalid> - 2014-05-03 02:08 -0400
      Re: pass by address "Bill Cunningaham" <nospam@nspam.invalid> - 2014-05-03 11:46 -0400
    Re: pass by address Kaz Kylheku <kaz@kylheku.com> - 2014-05-03 21:43 +0000

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