Difference between function pointers

[ram kishore]

What is the difference between
(int *) fun() and int *fun() ?

What is the advantage of pointers to functions?

[jacob navia]

ram kishore wrote:

What is the difference between
(int *) fun() and int *fun() ?

What is the advantage of pointers to functions?

Do your own homework

--
jacob navia
jacob at jacob point remcomp point fr
logiciels/informatique
http://www.cs.virginia.edu/~lcc-win32

[Richard Heathfield]

ram kishore said:

What is the difference between
(int *) fun() and int *fun() ?

()

What is the advantage of pointers to functions?

When you need to point to a function, nothing beats them.

--
Richard Heathfield <http://www.cpax.org.uk >
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

[zR0]

On Jul 25, 12:19*pm, ram kishore <rapol...@gmail .comwrote:

What *is the difference between
(int *) fun() and int *fun() ?

What is the advantage of pointers to functions?

This can be a good resource on this topic.
http://www.newty.de/fpt/index.html

[Richard Bos]

zR0 <ro************ ***@gmail.comwr ote:

On Jul 25, 12:19=A0pm, ram kishore <rapol...@gmail .comwrote:

What =A0is the difference between
(int *) fun() and int *fun() ?

What is the advantage of pointers to functions?

This can be a good resource on this topic.
http://www.newty.de/fpt/index.html

Not if you're programming in C, it can't. That's very C++-oriented.

Richard

[Nick Keighley]

On 25 Jul, 08:19, ram kishore <rapol...@gmail .comwrote:

What *is the difference between
(int *) fun() and int *fun() ?

one gives a syntax error the other doesn't

What is the advantage of pointers to functions?

1. call backs
2. threaded interpreters
3. really cool looking code

look up qsort() in your textbook

--
Nick Keighley

Error on line 0: Lazy programmer.

[Keith Thompson]

Nick Keighley <ni************ ******@hotmail. comwrites:

On 25 Jul, 08:19, ram kishore <rapol...@gmail .comwrote:

>What *is the difference between
(int *) fun() and int *fun() ?

one gives a syntax error the other doesn't

[...]

Not necessarily. I just wrote a small syntactically correct program
that uses both constructs. But one of them probably doesn't mean what
the OP thinks it means.

--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
Nokia
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

[pete]

ram kishore wrote:

What is the advantage of pointers to functions?

All function calls are made
with an operand of pointer to function type.

--
pete

[Keith Thompson]

pete <pf*****@mindsp ring.comwrites:

ram kishore wrote:

>What is the advantage of pointers to functions?

All function calls are made
with an operand of pointer to function type.

True.

Then the question the OP should have asked is:

What is the advantage of pointers to functions other than those that
result from the implicit conversion of a function name used as the
prefix of a function call?

--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
Nokia
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

[pete]

Keith Thompson wrote:

pete <pf*****@mindsp ring.comwrites:

>ram kishore wrote:

>>What is the advantage of pointers to functions?

All function calls are made
with an operand of pointer to function type.

True.

Then the question the OP should have asked is:

What is the advantage of pointers to functions other than those that
result from the implicit conversion of a function name used as the
prefix of a function call?

I recall recently,
in one of the web pages from a URL posted to this newsgroup,
advice that function calls should properly be made this way:
either
function_name() ;
or
(*function_poin ter)();

I wouldn't write function calls differently
for function name versus pointer constructs,
but if I would, I would do it this way:
either
(&function_name )();
or
function_pointe r();

The other way doesn't make any sense.

--
pete