logb(), logbf()

compute exponent 

Function


SYNOPSIS

#include <math.h>

double logb(double x)

float logbf(float x)


DESCRIPTION

The logb() function computes exponent of x, which is the integral part of logr|x|, as a signed floating point value, for a non-zero x, where r is the radix of the machine's floating-point arithmetic.

The logbf() is a single-precision version of the logb() function.


PARAMETERS

x 

Is the number whose exponent is computed.


RETURN VALUES

If successful, logb() returns the exponent of x.

If x is NaN, NaN is returned.

If x is 0.0, -HUGE_VAL is returned.


CONFORMANCE

UNIX 98.


MULTITHREAD SAFETY LEVEL

MT-Safe.


PORTING ISSUES

None.


AVAILABILITY

PTC MKS Toolkit for Professional Developers
PTC MKS Toolkit for Enterprise Developers
PTC MKS Toolkit for Enterprise Developers 64-Bit Edition


SEE ALSO

Functions:
exp(), log(), math(), pow(), sqrt()


PTC MKS Toolkit 9.6 Documentation Build 9.