Pointers to functions!!Please give a small tutorial

[anvartk]

I am confused about
advanced pointer concepts
of functions.
Give a small tutorial
or suggest any free tutorial or
a book

 

[rushtosiva]

Hi
You can use the book "Pointer in C" by Yashawant Kanitkar or you can read "Writing TSRs in C" by Yashawant Kanitkar, the first 3 chapters to get an overview of the functions to pointers. Hope this helps you.

Regards
Siva

 

[vkavith]

Well MSDN should provide enough information on this and not to forget the online help provided along with all compilers.
For a sample here is a short code..
..

#include <stdio.h>

void (*func)(int);
void myfunction (int x);

int main ()
{

func = myfunction; // associate to the function pointer
(*func)(10);
getch ();

return 1;
}

void myfunction (int x)
{
printf (&quot;Value = %d&quot;, x);
}

 

[rbobbitt]

If you don't already have it, get The C Programming Language (K&amp;R2). It has excellent explanations of function pointers.

anvartk, if you could ask a more specific question, we might be able to help you better. What *exactly* are you confused about?

sriks, did you pull that from MSDN??



Russ
bobbitts@hotmail.com

http://home.earthlink.net/~bobbitts

 

[vkavith]

rbobbitt,
Nope.. that was my code.

Thnx
Sriks

 

[Guest_imported]

Well, I have just decided to learn C about 1 to 2 months ago and now I am stuck on Converting binary numbers into decimals and viceversa can you help me on that?

 

[rbobbitt]

Hi,

To convert a string of 1's and 0's into a decimal number, you can use the standard library function strtoul:

e.g.

char bin[]=&quot;10001&quot;;

unsigned long dec=strtoul(bin,NULL,2);

The other way around, you can create a mask to compare your decimal number against and compare the number and the mask while repeatedly shifting the mask until all the bits have been looked at.

Here is a great link that explains the above with code examples:

http://home.att.net/~jackklein/ctips01.html

HTH,

Russ
bobbitts@hotmail.com

http://home.earthlink.net/~bobbitts