Modern Math Modf

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Modf

Splits a number into whole and fractional parts that both keep its sign.

Syntax

Modf( byval x as float64, byref ipart as float64 ) as float64

Notes

• Returns the fraction and writes the integer part through ipart. Both keep the sign of the input, which is what makes the two parts add back to it.
• That sign rule is the difference from Floor: Modf( -2.5 ) gives -2 and -0.5, not -3 and 0.5.
• The integer part comes back as a float64, so it is exact for any magnitude the type can hold.

Examples

#import "std/numeric"
using numeric

dim as float64 ip
print Modf( 2.75, ip )       '' 0.75
print ip                     '' 2

'' BOTH parts keep the sign, so they add back to the input
print Modf( -2.5, ip )       '' -0.5
print ip                     '' -2

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Library: Math Library
Category: Math Library
Documented under: Members