frexp(3)

NAME

frexp, frexpf, frexpl — convert floating-point number to fractional and integral components

SYNOPSIS

/* -lm */
#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() 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. The frexpf() function is a single precision version of frexp(). The frexpl() function is an extended precision version of frexp().

RETURN VALUES

The frexp(), frexpf() and frexpl() 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.

SEE ALSO

ldexp(3), modf(3)

STANDARDS

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