NAME

frexp, frexpf, frexpl —

convert floating-point number to fractional and integral components

LIBRARY

Math Library (libm, -lm)

SYNOPSIS

#include <math.h>

double
frexp(double value, int *exp);

float
frexpf(float value, int *exp);

long double
frexpl(long double value, int *exp);

DESCRIPTION

The frexp(), frexpf() and frexpl() functions break a floating-point number into a normalized fraction and an integral power of 2. They store the integer in the int object pointed to by exp.

RETURN VALUES

These functions return the value x, such that x is a double with magnitude in the interval [1/2, 1) or zero, and value equals x times 2 raised to the power *exp. If value is zero, both parts of the result are zero.

STANDARDS

The frexp(), frexpf(), and frexpl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).