Modern Math LogB

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LogB

Returns the binary exponent of a number as a floating-point value.

Syntax

LogB( x )

Notes

• The power of two a number lies between: LogB( 1000.0 ) is 9 because 1000 is from 512 up to 1024.
• 0 gives minus infinity.
• Frexp gives the exponent together with the fraction.
• Overloaded on float64 and on float32: a single-precision argument takes the single-precision path and does not widen.

Examples

#import "std/numeric"
using numeric

print LogB( 1024.0 )         '' 10
print LogB( 1000.0 )         '' 9
print LogB( 0.75 )           '' -1

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Library: Math Library
Category: Math Library
Documented under: The libm surface