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log2

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< c‎ | numeric‎ | math
Revision as of 15:29, 1 July 2013 by P12bot (Talk | contribs)

 
 
 
Common mathematical functions
Functions
Basic operations
(C99)
(C99)
(C99)
(C99)
(C99)
(C99)(C99)(C99)
Exponential functions
(C99)
(C99)
(C99)
log2
(C99)
Power functions
(C99)
(C99)
Trigonometric and hyperbolic functions
(C99)
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(C99)
Error and gamma functions
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(C99)
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Nearest integer floating point operations
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Floating point manipulation functions
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Classification
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Macro constants
 
Defined in header <math.h>
float       log2f( float arg );
(since C99)
double      log2( double arg );
(since C99)
long double log2l( long double arg );
(since C99)

Computes the base 2 logarithm of arg.

Parameters

arg - floating point value

Return value

log
2
(arg)

Domain error occurs if arg is negative. NAN is returned in that case.

Range error occurs if arg is 0. -HUGE_VAL is returned in that case.

See also

(C99)(C99)
computes natural (base-e) logarithm (ln(x))
(function) [edit]
computes common (base-10) logarithm (log10(x))
(function) [edit]