C++ Programming/Code/Standard C Library/Functions/frexp

From Wikibooks, open books for an open world
Jump to: navigation, search

frexp[edit]

Syntax
#include <cmath>
double frexp( double num, int* exp );

The function frexp() is used to decompose num into two parts: a mantissa between 0.5 and 1 (returned by the function) and an exponent returned as exp. Scientific notation works like this:

num = mantissa * (2 ^ exp)
Related topics
ldexp - modf