Where is pow function defined and implemented in C

Question

I read that the pow(double, double) function is defined in "math.h" but I can't find its declaration.

Does anybody know where this function declared? And where is it implemented in C?

Reference:

http://publications.gbdirect.co.uk/c_book/chapter9/maths_functions.html

Answer 1

Its here and also here. Also go on wikipedia

You will find pow there.

Answer 2

The actual implementation of pow may vary from compiler to compiler. Generally, math.h (or a vendor-specific file included by math.h) provides the prototype for pow (i.e., its declaration), but the implementation is buried in some library file such as libm.a. Depending on your compiler, the actual source code for pow or any other library function may not be available.