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Geek Culture / some c programmers here?

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The Big Babou
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Posted: 1st Dec 2003 22:09
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if so, could you tell me how the DBP code 3^3 is written in c? i know that is is a totally newbie question, but thats what i am to c. thank you
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IanM
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Posted: 1st Dec 2003 22:21
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Result# = 3 ^ 3

becomes

Result = pow(3,3)
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OSX Using Happy Dude
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Posted: 1st Dec 2003 22:29
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You could also do :

result=3*3*3; Its possible the compiler would reduce this trite example to result=27;


Mirrors are more fun than television. Well, that was fun, in a not-so-fun sort of way...
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IanM
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Posted: 1st Dec 2003 22:31
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It would probably do the same for the POW function - they tend to be implemented as a built-in function in the compiler
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The Big Babou
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Posted: 1st Dec 2003 22:40 Edited at: 1st Dec 2003 22:41
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and again the db forum members prove themselves as helpful and nice people. i was searching for the pow function. thank you two
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OSX Using Happy Dude
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Posted: 1st Dec 2003 22:50
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I thought POW was a function - never used it actually...


Mirrors are more fun than television. Well, that was fun, in a not-so-fun sort of way...
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TheAbomb12
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Posted: 2nd Dec 2003 01:21 Edited at: 2nd Dec 2003 01:21
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Quote: "It would probably do the same for the POW function - they tend to be implemented as a built-in function in the compiler"


dont you need "math.h"?? just to be on the safe side, we don't know what compiler he is using...

Amist the Blue Skies...
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The Big Babou
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Posted: 2nd Dec 2003 03:28
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I'm using the gcc compiler (with Dev-C++) and it seems he doesn't know the pow function, but i had math.h already included.
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IanM
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Posted: 2nd Dec 2003 13:16
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My bad ... try powf instead.

Just because the function may be built-in, doesn't mean that you don't need a header file for it.

In fact, with GCC, it appears that it isn't a built-in for powf, but there is for other commands. But if you don't include math.h, you won't get the built-in functions because they are defined under different names and use the preprocessor to translate to the fast versions.
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The Big Babou
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Posted: 2nd Dec 2003 15:25
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now as i'm reading my last post, it sounds that it didn't work to me. but the pow function worked. thanks again IanM. I didn't know the compiler can have inbuilt functions too, i thought you have to include the right header file for a function. well at least i had already math.h included, so that pow() worked fine.
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IanM
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Posted: 2nd Dec 2003 18:16
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Built-in functions are compiler specific - there is no guarantee that a compiler will provide any at all, but generally you will still need to include the correct headers
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