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| From | "Bill Cunningham" <nosapm@nspam.invalid> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: pass by address |
| Date | 2014-05-02 18:09 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <lk152a$1vf$1@dont-email.me> (permalink) |
| References | <lk10j7$uhr$1@dont-email.me> <NxU8v.443052$1p2.55006@fx13.iad> |
"Lew Pitcher" <lew.pitcher@digitalfreehold.ca> wrote in message
news:NxU8v.443052$1p2.55006@fx13.iad...
> Bill, think about this one a bit....
>
> int a = 15;
> int *p;
>
> p = &a;
>
> printf("%d\n",*p);
> scanf("%d\n",p);
That's really simple to interpret. Anyway. You are passing to printf the
value stored at the pointee's address. With the scanf you are passing the
pointer's address. Since pointers can only hold addresses. I would say the
scanf example is "pass by address" and the printf example is "pass by
value". Is that right? But with scanf in your example; that's the first time
I've ever seen the /pointer's/ address passed. Usually it's the /pointee's/
address using the &. But then that second parameter is an elipses and I
haven't considered variable argument lists. Way over my head right now
anyway.
Bill
Bill
Bill
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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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