NAME

frexp — 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);

DESCRIPTION

The frexp() function breaks a floating-point number into a normalized fraction and an integral power of 2. It stores the integer in the int object pointed to by exp.

RETURN VALUES

The frexp() function returns 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.

SEE ALSO

ldexp(3), math(3), modf(3)

STANDARDS

The frexp() function conforms to ANSI X3.159-1989 (“ANSI C89”).