Return to frexp.3 CVS log

Up to [CSRG BSD Unix] / 43BSDReno / lib / libc / gen

Annotation of 43BSDReno/lib/libc/gen/frexp.3, revision 1.1.1.1

1.1       root        1: .\"    @(#)frexp.3     6.3 (Berkeley) 4/13/87
                      2: .\"
                      3: .TH FREXP 3 "April 13, 1987"
                      4: .AT 3
                      5: .SH NAME
                      6: frexp, ldexp, modf \- split into mantissa and exponent
                      7: .SH SYNOPSIS
                      8: .nf
                      9: .B double frexp(value, eptr)
                     10: .B double value;
                     11: .B int *eptr;
                     12: .PP
                     13: .B double ldexp(value, exp)
                     14: .B double value;
                     15: .PP
                     16: .B double modf(value, iptr)
                     17: .B double value, *iptr;
                     18: .SH DESCRIPTION
                     19: Every nonzero number can be written uniquely as
                     20: .if t \fIx\fP\|\(**\|2\u\fIn\fP\d,
                     21: .if n \fIx\fP * 2^\fIn\fP,
                     22: where the ``mantissa'' (fraction) \fIx\fP is in the range 0.5 <= |x| < 1.0,
                     23: and the ``exponent'' \fIn\fP is an integer.  \fIFrexp\fP returns the
                     24: mantissa of a double \fIvalue\fP, and stores the exponent indirectly in
                     25: the location pointed to by \fIeptr\fP.  If \fIvalue\fP is 0, both results
                     26: returned by \fIfrexp\fP are 0.
                     27: .PP
                     28: \fILdexp\fP returns the quantity
                     29: .if t \fIvalue\|\(**\|2\u\fIexp\fP\d.
                     30: .if n \fIvalue\fP * 2^\fIexp\fP.
                     31: .PP
                     32: \fIModf\fP returns the signed fractional part of \fIvalue\fP
                     33: and stores the integer part indirectly in the location pointed
                     34: to by \fIiptr\fP.
                     35: .SH DIAGNOSTICS
                     36: If \fIldexp\fP would cause overflow, \fBHUGE\fP is returned
                     37: and \fIerrno\fP is set to \fBERANGE\fP.

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.