AutoHotkey Community

[Decarlo110]

Try the following code (make sure the editor window accepts 83 characters minimum). The highlighted sum is the first instance where the sum is incorrect. This may also have something to do with subsequent lines where there are trailing zeros.

[Chris]

If you mean that 14472334024676220.0 should be one greater, this is caused by the fact floating point values are limited to 16 digits of precision. This is because AutoHotkey internally uses doubles, which are 64-bit floating point values.

Although I realize you're using floating point math to take advantage of SetFormat's ability to provide leading zeros, you can work around this by using integer math instead. Integers are 64-bit and can range between -9223372036854775808 and 9223372036854775807 (19 digits). If you go beyond that range, it will probably wrap around back to zero.

To use integer math, ensure each operand lacks a decimal portion. You can provide leading zeros with something like:

Padded = 000000000000000000000000%a1% ; Add more zeros to make a total of 80 zeros.
StringRight, Padded, Padded, 80

[Decarlo110]

Thank you for the explanation, and useful tip.

I noticed that Microsoft Calculator is able to work with 32 digits of accuracy. I'm wondering what method it uses since it doesnt seem to have the 64-bit limitation, and whether AutoHotkey can adopt it also, if it doesnt slow performance? possibly with no upper limit, if that is possible?
_________________
1) The Open Source Definition http://www.opensource.org/docs/definition_plain.php

2) Intuitive. Logical. Versatile. Adaptable. <<AutoHotkey>>

[Chris]

It would definitely reduce performance in many aspects of the program to increase the limit. This is because modern CPUs and compilers are optimized for 32-bit and 64-bit math.

An alternative would be to selectively apply the slow method when numbers larger than the limit are detected. However, such detection would incur performance overhead that doesn't seem justified given how rarely such enormous numbers are needed.

In any case, the suggestion is appreciated. I wish there were a way to do it without giving up so much.