#include <math.h>float log2f(float num);double log2(double num); long double log2l(long double num); 

log2( ), log2f( ), and log2l( ) were added by C99.

The log2( ) family of functions returns the base 2 logarithm for num. A domain error occurs if num is negative. If num is zero, a range error is possible.

Related functions are log( ) and log10( ).

C(s)C++ Programmer's Reference
C Programming on the IBM PC (C Programmers Reference Guide Series)
ISBN: 0673462897
EAN: 2147483647
Year: 2002
Pages: 539

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