Content-type: text/html Man page of scalbln

scalbln

Section: Mathematical Library Functions (3M)
Updated: 12 Jul 2006
Index Return to Main Contents
 

NAME

scalbln, scalblnf, scalblnl, scalbn, scalbnf, scalbnl - compute exponent using FLT_RADIX  

SYNOPSIS

c99 [ flag... ] file... -lm [ library... ]
#include <math.h>

double scalbln(double x, long n);

float scalblnf(float x, long n);

long double scalblnl(long double x, long n);

double scalbn(double x, int n);

float scalbnf(float x, int n);

long double scalbnl(long double x, int n);  

DESCRIPTION

These functions compute x * FLT_RADIX **n efficiently, not normally by computing FLT_RADIX **n explicitly.  

RETURN VALUES

Upon successful completion, these functions return x * FLT_RADIX **n .

If the result would cause overflow, a range error occurs and these functions return ±HUGE_VAL, ±HUGE_VALF, and ±HUGE_VALL (according to the sign of x) as appropriate for the return type of the function.

If x is NaN, a NaN is returned.

If x is ±0 or ±Inf, x is returned.

If x is 0, x is returned.  

ERRORS

These functions will fail if:

Range Error The result overflows.

If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the overflow floating-point exception is raised.

 

USAGE

An application wanting to check for exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception has been raised. An application should either examine the return value or check the floating point exception flags to detect exceptions.  

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
Interface StabilityStandard
MT-LevelMT-Safe

 

SEE ALSO

feclearexcept(3M), fetestexcept(3M), math.h(3HEAD), scalb(3M), attributes(5), standards(5)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
ERRORS
USAGE
ATTRIBUTES
SEE ALSO

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Time: 02:39:33 GMT, October 02, 2010