.TH FREXP 2.SH NAMEfrexp, ldexp, modf \- split into mantissa and exponent.SH SYNOPSIS.B #include <u.h>.br.B #include <libc.h>.PP.Bdouble frexp(double value, int *eptr).PP.Bdouble ldexp(double value, int exp).PP.Bdouble modf(double value, double *iptr).SH DESCRIPTION.I Frexpreturns the mantissa of.I valueand 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 Ldexpreturns the quantity.if t .IR value ×2\u\s-2 exp \s0\d..if n .IR value *2** exp..PP.I Modfreturns the signed fractional part of.I valueand stores the integer part indirectlythrough.IR iptr ..SH SOURCE.B /sys/src/libc/port/frexp.c.SH SEE ALSO.IR intro (2).SH DIAGNOSTICS.I Ldexpreturns 0 for underflow and the appropriately signed infinityfor overflow.
.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 signed 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.