Modern Math CopySign

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CopySign

Returns a number's size with the sign of a second number, zero's sign included.

Syntax

CopySign( x, y )

Notes

• Reads the sign bit of y, so it tells -0.0 from 0.0 where y < 0 cannot.
• 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 CopySign( 3.0, -1.0 )  '' -3
print CopySign( -2.5, 1.0 )  '' 2.5
print CopySign( 1.0, -0.0 )  '' -1 -- the sign of a negative zero

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