C++ Programming/Code/Standard C Library/Functions/frexp
frexp
[edit | edit source]| Syntax |
#include <cmath>
double frexp( double num, int* exp );
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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)