tarretarretarre

Is the bool outcome correct when dividing by zero?

6 posts in this topic

#1 ·  Posted (edited)

Hi!

I know i can check for zero divission, but that is not the question, i was just wondering if this is working as intended?

 

Global $zd = 0 / 0

MsgBox(0, 0, $zd)
MsgBox(0,"Double", VarGetType($zd))

MsgBox(0, "1. False", ($zd > 0 ))
MsgBox(0, "2. False", ($zd < 0 ))
MsgBox(0, "3. False", ($zd == 0 ))

MsgBox(0, "4. True", ($zd <> 0 ))
MsgBox(0, "5. True", ($zd >= 0 ))
MsgBox(0, "6. True", ($zd <= 0 ))

 

This is the same code in javascript

var zd = 0 / 0;

console.log(zd); // NaN
console.log(typeof zd); // number

console.log((zd > 0)); // false
console.log((zd < 0)); // false
console.log((zd == 0)); // false

console.log((zd != 0)); // true
console.log((zd >= 0)); // false
console.log((zd <= 0)); // false

 

https://jsfiddle.net/5fnLjcpv/

 

 

Edited by tarretarretarre

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#2 ·  Posted

Schrödinger's float is both greater than and less than zero.

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#3 ·  Posted

What exactly are you expecting, and what are you getting that isn't as expected? AutoIt isn't Javascript, so you can't compare apples to oranges, compare it to what you expect the answer to be and let us know what that is.

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#4 ·  Posted

I believe the last three MsgBoxes are being compared by string rather than number.

For checking for undefined you can use something I found in another post:

Global $zd = StringStripWS(0/0, 3)
MsgBox(4096, 'Is Number', StringCompare($zd, String(Number($zd))) > 0 ? "Result : " & $zd & @CRLF & "Is a number : " & False : "Result : " & $zd & @CRLF & "Is a number : " & True)

 

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#5 ·  Posted

"IND" stands for "indeterminate". That's why you can't rely on the results of all your operations (in variation of "garbage in, garbage out": IND in, IND out ;))
https://stackoverflow.com/questions/347920/what-do-1-inf00-1-ind00-and-1-ind-mean

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