TH FREXP 2
SH NAME
frexp, ldexp, modf \- split into mantissa and exponent
SH SYNOPSIS
B #include <u.h>
br
B #include <libc.h>
PP
B
double frexp(double value, int *eptr)
PP
B
double ldexp(double value, int exp)
PP
B
double modf(double value, double *iptr)
SH DESCRIPTION
I Frexp
returns the mantissa of
I value
and stores the exponent indirectly through
IR eptr ,
so that
I value
=
if t .IR frexp ( value )×2\u\s-2 (*eptr) \s0\d
if n .IR frexp ( value )*2** (*eptr).
PP
I Ldexp
returns the quantity
if t .IR value ×2\u\s-2 exp \s0\d.
if n .IR value *2** exp.
PP
I Modf
returns the positive fractional part of
I value
and stores the integer part indirectly
through
IR iptr .
SH SOURCE
B /sys/src/libc/port/frexp.c
SH SEE ALSO
IR intro (2)
SH DIAGNOSTICS
I Ldexp
returns 0 for underflow and the appropriately signed infinity
for overflow.

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