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

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