scalbln(), scalblnf(), scalblnl()

Load the exponent of a radix-independent floating point number

Synopsis:

#include <math.h>

double scalbln ( double x,
                 long int n );

float scalblnf ( float x,
                 long int n );

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

Arguments:

x
The floating point number that you want to multiply by the exponent.
n
The exponent to apply to the radix of the machine's floating-point arithmetic.

Library:

libm

Use the -l m option to qcc to link against this library.

Description:

The scalbln(), scalblnf(), and scalblnl() functions compute x × rn, where r is the radix of the machine's floating-point arithmetic. The difference between the scalbn* and scalbln* functions is the type of the second argument.

To check for error situations, use feclearexcept() and fetestexcept():

Returns:

x × rn

If a range error due to overflow occurs, a range error occurs, and these functions return ±HUGE_VAL, ±HUGE_VALF, or ±HUGE_VALL, as appropriate. If a range error due to underflow occurs, the correct result (after rounding) is returned.

Errors:

FE_OVERFLOW
The result would cause an overflow.
FE_UNDERFLOW
The result would cause an underflow.

Classification:

ANSI, POSIX 1003.1

Safety:  
Cancellation point No
Interrupt handler No
Signal handler No
Thread Yes