logb(), logbf() compute exponent	Function
	SYNOPSIS DESCRIPTION PARAMETERS RETURN VALUES CONFORMANCE MULTITHREAD SAFETY LEVEL PORTING ISSUES AVAILABILITY SEE ALSO

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SYNOPSIS

#include <math.h>

double logb(double x)

float logbf(float x)

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DESCRIPTION

The logb() function computes exponent of x, which is the integral part of log_r|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.

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PARAMETERS

x 

Is the number whose exponent is computed.

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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.

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CONFORMANCE

UNIX 98.

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MULTITHREAD SAFETY LEVEL

MT-Safe.

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PORTING ISSUES

None.

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AVAILABILITY

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

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SEE ALSO

Functions:

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

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PTC MKS Toolkit 10.5 Documentation Build 40.