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Mathematical Library Functionsscalb(3M)


NAME

 scalb - load exponent of a radix-independent floating-point number

SYNOPSIS

 
#include <math.h>
double scalb(double x, double n);

DESCRIPTION

 

The scalb() function computes x * rn, where r is the radix of the machine's floating point arithmetic. When r is 2, scalb() is equivalent to ldexp(3C).

RETURN VALUES

 

Upon successful completion, the scalb() function returns x * rn.

If the correct value would overflow, scalb() returns +-HUGE_VAL (according to the sign of x) and sets errno to ERANGE.

If the correct value would underflow to 0.0, scalb() returns 0 and sets errno to ERANGE.

The scalb() function returns x when x is +-Inf.

If x or n is NaN, then scalb() returns NaN.

For exceptional cases, matherr(3M) tabulates the values to be returned as dictated by Standards other than XPG4.

ERRORS

 

The scalb() function will fail if:

ERANGE
The correct value would overflow or underflow.

USAGE

 

An application wishing to check for error situations should set errno to 0 before calling scalb(). If errno is non-zero on return, or the return value is NaN, an error has occurred.

ATTRIBUTES

 

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

ATTRIBUTE TYPEATTRIBUTE VALUE
MT-LevelMT-Safe

SEE ALSO

 

ldexp(3C), matherr(3M), attributes(5)


SunOS 5.9Go To TopLast Changed 29 Dec 1996

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.