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  13 .TH frexp 3M "12 Jul 2006" "SunOS 5.11" "Mathematical Library Functions"
  14 .SH NAME
  15 frexp, frexpf, frexpl \- extract mantissa and exponent from a floating-point
  16 number
  17 .SH SYNOPSIS
  18 .LP
  19 .nf
  20 c99 [ \fIflag\fR... ] \fIfile\fR... \fB-lm\fR [ \fIlibrary\fR... ]
  21 #include <math.h>
  22 
  23 \fBdouble\fR \fBfrexp\fR(\fBdouble\fR \fInum\fR, \fBint *\fR\fIexp\fR);
  24 .fi
  25 
  26 .LP
  27 .nf
  28 \fBfloat\fR \fBfrexpf\fR(\fBfloat\fR \fInum\fR, \fBint *\fR\fIexp\fR);
  29 .fi
  30 
  31 .LP
  32 .nf
  33 \fBlong double\fR \fBfrexpl\fR(\fBlong double\fR \fInum\fR, \fBint *\fR\fIexp\fR);
  34 .fi
  35 
  36 .SH DESCRIPTION
  37 .sp
  38 .LP
  39 These functions break a floating-point number into a normalized fraction and an
  40 integral power of 2. They store the integer exponent in the \fBint\fR object
  41 pointed to by \fIexp\fR.
  42 .SH RETURN VALUES
  43 .sp
  44 .LP
  45 For finite arguments, these functions return the value \fIx\fR, such that
  46 \fIx\fR is a \fBdouble\fR with magnitude in the interval [\(12, 1) or 0, and
  47 \fInum\fR equals \fIx\fR times 2 raised to the power *\fIexp\fR.
  48 .sp
  49 .LP
  50 If \fInum\fR is NaN, NaN is returned and the value of *\fIexp\fR is
  51 unspecified.
  52 .sp
  53 .LP
  54 If \fInum\fR is \(+- 0, \(+- 0 is returned and the value of *\fIexp\fR is 0.
  55 .sp
  56 .LP
  57 If \fInum\fR is \(+-Inf, \fInum\fR is returned and the value of *\fIexp\fR is
  58 unspecified.
  59 .SH ATTRIBUTES
  60 .sp
  61 .LP
  62 See \fBattributes\fR(5) for descriptions of the following attributes:
  63 .sp
  64 
  65 .sp
  66 .TS
  67 tab() box;
  68 cw(2.75i) |cw(2.75i) 
  69 lw(2.75i) |lw(2.75i) 
  70 .
  71 ATTRIBUTE TYPEATTRIBUTE VALUE
  72 _
  73 Interface StabilityStandard
  74 _
  75 MT-LevelMT-Safe
  76 .TE
  77 
  78 .SH SEE ALSO
  79 .sp
  80 .LP
  81 \fBisnan\fR(3M), \fBldexp\fR(3M), \fBmodf\fR(3M), \fBattributes\fR(5),
  82 \fBstandards\fR(5)