NAME

frexp, ldexp, modf − split into mantissa and exponent

SYNOPSIS

#include <math.h>

double frexp(double value, int ∗eptr);

double ldexp(double value, int exp);

double modf(double value, double ∗iptr);

DESCRIPTION

frexp returns a mantissa x and (indirectly through eptr) an exponent n such that x multiplied by 2 raised to n is equal to value:

value = x∗2^n

ldexp returns the quantity value∗2^exp. 

modf returns the positive fractional part of value and stores the integer part indirectly through iptr. 

7th Edition  —  August 1, 1992