log2 not found in my math.h?

Question

I\'m using a fairly new install of Visual C++ 2008 Express.

I\'m trying to compile a program that uses the log2 function, which was found by including using Eclipse

Answer 1

From here:

Prototype: double log2(double anumber);
Header File: math.h (C) or cmath (C++)

Alternatively emulate it like here

#include   
...  
// Calculates log2 of number.  
double Log2( double n )  
{  
    // log(n)/log(2) is log2.  
    return log( n ) / log( 2 );  
}  

Unfortunately Microsoft does not provide it.