Using math.h

Hi all,
I am writing a Cocoa app, and for one of my methods, I'd like to use
exponential math. For example, I want to raise 10 to the power of 3
and store the result. I found the pow() function in math.h, and read
the docs in the man page. So, in my code, I have something like:
double a = 10;
double b = 3;
double c = pow(a, b);
But when compiling my app, I get a compile error "called object 'pow'
is not a function".
I've added #import <math.h> to the top of my .m file. But still
nothing.
How do I get pow() and the other math functions to work in my Cocoa app?
Thanks.
Nelson 
Try #include, not #import:
#include <math.h>
It is also available in CoreServices Framework (Don't forget to add
the framework to the project):
#import <CoreServices/CoreServices.h>
Julio Cesar Silva dos Santos
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Skype: jcssantos01
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On 14/03/2007, at 11:22, Nelson Santos wrote:
> Hi all,
>
> I am writing a Cocoa app, and for one of my methods, I'd like to
> use exponential math. For example, I want to raise 10 to the power
> of 3 and store the result. I found the pow() function in math.h,
> and read the docs in the man page. So, in my code, I have
> something like:
>
> double a = 10;
> double b = 3;
> double c = pow(a, b);
>
> But when compiling my app, I get a compile error "called object
> 'pow' is not a function".
>
> I've added #import <math.h> to the top of my .m file. But still
> nothing.
>
> How do I get pow() and the other math functions to work in my Cocoa
> app?
>
> Thanks.
> Nelson

On Mar 14, 2007, at 10:22 AM, Nelson Santos wrote:
> double a = 10;
> double b = 3;
> double c = pow(a, b);
>
> But when compiling my app, I get a compile error "called object
> 'pow' is not a function".
>
> I've added #import <math.h> to the top of my .m file. But still
> nothing.
What you did works for me. I don't suppose you're declaring
something else called "pow" anywhere in your code?
Andy 
When I make a new sample project, all math.h functions work (and as
far as I know all other C standard library functions), I believe that
these libraries are included in the Cocoa framework. So there might
be some other code of yours conflicting, do you have an object
(variable) called "pow"? You can try to NSLog other math functions
such as sqrt(16) or sin(3.1415) to see whether the problem is indeed
due math.h not being included.
Good luck, Patrick
On 14Mar07, at 10:22 AM, Nelson Santos wrote:
> Hi all,
>
> I am writing a Cocoa app, and for one of my methods, I'd like to
> use exponential math. For example, I want to raise 10 to the power
> of 3 and store the result. I found the pow() function in math.h,
> and read the docs in the man page. So, in my code, I have
> something like:
>
> double a = 10;
> double b = 3;
> double c = pow(a, b);
>
> But when compiling my app, I get a compile error "called object
> 'pow' is not a function".
>
> I've added #import <math.h> to the top of my .m file. But still
> nothing.
>
> How do I get pow() and the other math functions to work in my Cocoa
> app?
>
> Thanks.
> Nelson

Thanks everyone. Dumb mistake on my part.
pow was defined earlier for something else, as some of you
mentioned. DOh!
Nelson
On Mar 14, 2007, at 10:38 AM, Andy Lee wrote:
On Mar 14, 2007, at 10:22 AM, Nelson Santos wrote:
> double a = 10;
> double b = 3;
> double c = pow(a, b);
>
> But when compiling my app, I get a compile error "called object
> 'pow' is not a function".
>
> I've added #import <math.h> to the top of my .m file. But still
> nothing.
What you did works for me. I don't suppose you're declaring
something else called "pow" anywhere in your code?
Andy