Tribblix: manual page: scalbln.3m

SCALBLN(3M) Mathematical Library Functions SCALBLN(3M)

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