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  11 .TH scalbln 3M "12 Jul 2006" "SunOS 5.11" "Mathematical Library Functions"
  12 .SH NAME
  13 scalbln, scalblnf, scalblnl, scalbn, scalbnf, scalbnl \- compute exponent using
  14 FLT_RADIX
  15 .SH SYNOPSIS
  16 .LP
  17 .nf
  18 c99 [ \fIflag\fR... ] \fIfile\fR... \fB-lm\fR [ \fIlibrary\fR... ]
  19 #include <math.h>
  20 
  21 \fBdouble\fR \fBscalbln\fR(\fBdouble\fR \fIx\fR, \fBlong\fR \fIn\fR);
  22 .fi
  23 
  24 .LP
  25 .nf
  26 \fBfloat\fR \fBscalblnf\fR(\fBfloat\fR \fIx\fR, \fBlong\fR \fIn\fR);
  27 .fi
  28 
  29 .LP
  30 .nf
  31 \fBlong double\fR \fBscalblnl\fR(\fBlong double\fR \fIx\fR, \fBlong\fR \fIn\fR);
  32 .fi
  33 
  34 .LP
  35 .nf
  36 \fBdouble\fR \fBscalbn\fR(\fBdouble\fR \fIx\fR, \fBint\fR \fIn\fR);
  37 .fi
  38 
  39 .LP
  40 .nf
  41 \fBfloat\fR \fBscalbnf\fR(\fBfloat\fR \fIx\fR, \fBint\fR \fIn\fR);
  42 .fi
  43 
  44 .LP
  45 .nf
  46 \fBlong double\fR \fBscalbnl\fR(\fBlong double\fR \fIx\fR, \fBint\fR \fIn\fR);
  47 .fi
  48 
  49 .SH DESCRIPTION
  50 .sp
  51 .LP
  52 These functions compute \fIx\fR * \fBFLT_RADIX\fR^n efficiently, not normally
  53 by computing \fBFLT_RADIX\fR^n explicitly.
  54 .SH RETURN VALUES
  55 .sp
  56 .LP
  57 Upon successful completion, these functions return \fIx\fR *
  58 \fBFLT_RADIX\fR^\fIn\fR>.
  59 .sp
  60 .LP
  61 If the result would cause overflow, a range error occurs and these functions
  62 return \(+-\fBHUGE_VAL\fR, \(+-\fBHUGE_VALF\fR, and \(+-\fBHUGE_VALL\fR
  63 (according to the sign of \fIx\fR) as appropriate for the return type of the
  64 function.
  65 .sp
  66 .LP
  67 If \fIx\fR is NaN, a NaN is returned.
  68 .sp
  69 .LP
  70 If \fIx\fR is \(+-0 or \(+-Inf, \fIx\fR is returned.
  71 .sp
  72 .LP
  73 If \fIx\fR is 0, \fIx\fR is returned.
  74 .SH ERRORS
  75 .sp
  76 .LP
  77 These functions will fail if:
  78 .sp
  79 .ne 2
  80 .mk
  81 .na
  82 \fBRange Error\fR
  83 .ad
  84 .RS 15n
  85 .rt  
  86 The result overflows.
  87 .sp
  88 If the integer expression (\fBmath_errhandling\fR & \fBMATH_ERREXCEPT\fR) is
  89 non-zero, then the overflow floating-point exception is raised.
  90 .RE
  91 
  92 .SH USAGE
  93 .sp
  94 .LP
  95 An application wanting to check for exceptions should call
  96 \fBfeclearexcept\fR(\fBFE_ALL_EXCEPT\fR) before calling these functions. On
  97 return, if \fBfetestexcept\fR(\fBFE_INVALID\fR | \fBFE_DIVBYZERO\fR |
  98 \fBFE_OVERFLOW\fR | \fBFE_UNDERFLOW\fR) is non-zero, an exception has been
  99 raised. An application should either examine the return value or check the
 100 floating point exception flags to detect exceptions.
 101 .SH ATTRIBUTES
 102 .sp
 103 .LP
 104 See \fBattributes\fR(5) for descriptions of the following attributes:
 105 .sp
 106 
 107 .sp
 108 .TS
 109 tab() box;
 110 cw(2.75i) |cw(2.75i) 
 111 lw(2.75i) |lw(2.75i) 
 112 .
 113 ATTRIBUTE TYPEATTRIBUTE VALUE
 114 _
 115 Interface StabilityStandard
 116 _
 117 MT-LevelMT-Safe
 118 .TE
 119 
 120 .SH SEE ALSO
 121 .sp
 122 .LP
 123 \fBfeclearexcept\fR(3M), \fBfetestexcept\fR(3M), \fBmath.h\fR(3HEAD),
 124 \fBscalb\fR(3M), \fBattributes\fR(5), \fBstandards\fR(5)