The following progs differ only in the location of the prototype
(<--adjective) definition with respect to the main call. Both build and
behave for me. Is there a difference that amounts to something once the
subject matters gets stickier? MPJ
#include <stdio.h>
int main(void){
int i = 5;
void increment(int *);
increment(&i);
printf("i = %d\n",i);
return 0;
}
void increment(int *px){
int tmp = *px;
++ tmp;
*px = tmp;
}
#include <stdio.h>
void increment(int *);
int main(void){
int i = 5;
increment(&i);
printf("i = %d\n",i);
return 0;
}
void increment(int *px){
int tmp = *px;
++ tmp;
*px = tmp;
} 10 1531
On Wed, 17 Nov 2004 06:38:56 -0600, Merrill & Michele wrote: The following progs differ only in the location of the prototype (<--adjective) definition with respect to the main call. Both build and behave for me. Is there a difference that amounts to something once the subject matters gets stickier? MPJ
Yes, this is the difference between putting a function declaration in
a function (i.e. at block scope) or outside a function (i.e. at file
scope). Don't put function declarations in functions, if you do the
compiler is never required to validate the type of the declaration against
the function definition (it might anyway but it isn't required to). It is
also not where C programmers expect to find them. You won't go far wrong
if you stick to the rules
1. A static function declaration should go at or near the top of the file
where the function is defined. Some people prefer to put definition before
use to avoid the need for a declaration. That's fine too, although I like
having the declarations as a summary of the functions in the source file.
2. A non-static function declaration should be in an appropriate header
file that is included by all source files that use the function.
Lawrence
"Lawrence Kirby" <lk****@netacti ve.co.uk> wrote in message
news:pa******** *************** *****@netactive .co.uk... On Wed, 17 Nov 2004 06:38:56 -0600, Merrill & Michele wrote:
The following progs differ only in the location of the prototype (<--adjective) definition with respect to the main call. Both build and behave for me. Is there a difference that amounts to something once the subject matters gets stickier? MPJ
Yes, this is the difference between putting a function declaration in a function (i.e. at block scope) or outside a function (i.e. at file scope). Don't put function declarations in functions, if you do the compiler is never required to validate the type of the declaration against the function definition (it might anyway but it isn't required to). It is also not where C programmers expect to find them. You won't go far wrong if you stick to the rules
1. A static function declaration should go at or near the top of the file where the function is defined. Some people prefer to put definition before use to avoid the need for a declaration. That's fine too, although I like having the declarations as a summary of the functions in the source file.
2. A non-static function declaration should be in an appropriate header file that is included by all source files that use the function.
Thanks. I just violated Mr. Pop's injunction to go through K&R sequentially
and was leafing through C Unleashed. I had apologized to Mr. Summit for
printing off and binding his FAQs without giving him a cent while unaware
that I indeed had. There is a question I've been dying to ask though: what
the hell does 'foo' stand for? MPJ
"Merrill & Michele" <be********@com cast.net> wrote in message
news:r_******** ************@co mcast.com... There is a question I've been dying to ask though: what the hell does 'foo' stand for? MPJ
It's the name of a popular cafe frequented by programmers: The Foo Bar,
owned by Mr Foo.
"dandelion" <da*******@mead ow.net> wrote in message
news:41******** *************** @dreader12.news .xs4all.nl... "Merrill & Michele" <be********@com cast.net> wrote in message news:r_******** ************@co mcast.com... There is a question I've been dying to ask though: what the hell does 'foo' stand for? MPJ
It's the name of a popular cafe frequented by programmers: The Foo Bar, owned by Mr Foo.
And people stumble home from this bar from all continents? In America, we
have a homonym for foobar, and I doubt that this meaning is one a programmer
would like to have associated with his code. MPJ
"Merrill & Michele" <be********@com cast.net> wrote in message
news:Hu******** ************@co mcast.com... "dandelion" <da*******@mead ow.net> wrote in message news:41******** *************** @dreader12.news .xs4all.nl... "Merrill & Michele" <be********@com cast.net> wrote in message news:r_******** ************@co mcast.com... There is a question I've been dying to ask though: what the hell does 'foo' stand for? MPJ It's the name of a popular cafe frequented by programmers: The Foo Bar, owned by Mr Foo.
And people stumble home from this bar from all continents?
He's got lots of franchises.
In America, we have a homonym for foobar, and I doubt that this meaning is
one a programmer would like to have associated with his code. MPJ
Do you mean "Fubar" Fucked Up Beyond All Repair or Failed UniBus Address
Register (on a VAX)
see http://catb.org/~esr/jargon/html/F/foobar.html
Merrill & Michele wrote: "dandelion" <da*******@mead ow.net> wrote in message news:41******** *************** @dreader12.news .xs4all.nl...
"Merrill & Michele" <be********@com cast.net> wrote in message news:r_****** **************@ comcast.com...
There is a question I've been dying to ask though: what the hell does 'foo' stand for? MPJ It's the name of a popular cafe frequented by programmers: The Foo Bar, owned by Mr Foo.
Don't pull the newbies' legs -- they might fall off... ;-)
And people stumble home from this bar from all continents? In America, we have a homonym for foobar, and I doubt that this meaning is one a programmer would like to have associated with his code. MPJ
Have a look at the jargon file; the glossary provides quite a lot on
foo: http://www.catb.org/~esr/jargon/
Apart from that, bookmark it: It will often help to understand the
gibberish in comp.*
BTW: Asking google in a nice way also would have helped you.
Cheers
Michael
--
E-Mail: Mine is a gmx dot de address.
"Michael Mair" <Mi**********@i nvalid.invalid> wrote in message
news:30******** *****@uni-berlin.de...
Merrill & Michele wrote: "dandelion" <da*******@mead ow.net> wrote in message news:41******** *************** @dreader12.news .xs4all.nl...
"Merrill & Michele" <be********@com cast.net> wrote in message news:r_****** **************@ comcast.com...
There is a question I've been dying to ask though: what the hell does 'foo' stand for? MPJ
It's the name of a popular cafe frequented by programmers: The Foo Bar, owned by Mr Foo. Don't pull the newbies' legs -- they might fall off... ;-)
But... But... I *like* pulling legs.
Have a look at the jargon file; the glossary provides quite a lot on foo: http://www.catb.org/~esr/jargon/
<snigger>
Too late. I allready provided that link. It's fun, too.
"dandelion" <da*******@mead ow.net> wrote in message
news:41******** *************** @dreader12.news .xs4all.nl... "Merrill & Michele" <be********@com cast.net> wrote in message news:r_******** ************@co mcast.com... There is a question I've been dying to ask though: what the hell does 'foo' stand for? MPJ
It's the name of a popular cafe frequented by programmers: The Foo Bar, owned by Mr Foo.
dats kOOOOOOL.....
-Neo This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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