Float - something wrong - AHK v2-a116 Topic is solved

[TheArkive]

This script for AHK v2:

msgbox 1.0009

Shows this value in the msgbox:

1.0008999999999999

EDIT: Tried this in AHK v2-a112 and a108 ... same thing.

I tried this in AHK v1.1.33:

msgbox % 1.0009

And the expected 1.0009 is displayed.

[swagfag]

Floating-point numbers are formatted with full precision (but discarding redundant trailing zeroes), which may in some cases reveal their inaccuracy.

[TheArkive]

my bad.

[lexikos]

msgbox % 1.0009

The equivalent script for v2 is

Code: Select all

msgbox "1.0009"

because in v1 a floating-point literal is always just a string, but

All literal numbers are converted to pure binary numbers at load time and their string representation is discarded. For example, MsgBox 0x1 is equivalent to MsgBox 1, while MsgBox 1.0000 is equivalent to MsgBox 1.0 (because the float formatting has changed). Storing a number in a variable or returning it from a UDF retains its pure numeric status.
Source: v2-changes

[TheArkive]

Thanks @lexikos, looks like i gotta slow down and read more.