Making a comparison between large numbers

[Coolsurfer]

Is their anyway that I can compare 2 large integers with 33 digits? It seem that AutoIt treats small differences as equal probably because it uses a scientific notation which chops off a lot of numbers. is their anyway around this?

Example I want AutoIt to recognize the difference between

16777215167772081677721513668432

And

16777215167772081473348016312512

Is it possible?

[VicTT]

Only if you represent the numbers through arrays so that every digit would be an array element..and then simulate every operation you need done..That's how I would have done it in a "classical" programming language..I have no idea if AutoIt has any special functions to handle such numbers, or anything of the sort..It *CAN* be done, but it's a real hassle to multiply 2 such numbers..the addition function is simple, but say if you have "numbers"(digit arrays) A and B and want A*B, you would need a function to multiply the 2 arrays which can't be simulated by repetitive addition, because the for accepts only integer vars..anyway..it's a complicated matter..hope I didn't rant on the wrong subject too much..But I thought this is what you were actually asking..

[Coolsurfer]

Only if you represent the numbers through arrays so that every digit would be an array element..and then simulate every operation you need done..That's how I would have done it in a "classical" programming language..I have no idea if AutoIt has any special functions to handle such numbers, or anything of the sort..It *CAN* be done, but it's a real hassle to multiply 2 such numbers..the addition function is simple, but say if you have "numbers"(digit arrays) A and B and want A*B, you would need a function to multiply the 2 arrays which can't be simulated by repetitive addition, because the for accepts only integer vars..anyway..it's a complicated matter..hope I didn't rant on the wrong subject too much..But I thought this is what you were actually asking..

<{POST_SNAPBACK}>

So then what is the maximum number of digits that I can use? If necessary I can break up the larger numbers.

[buzz44]

You can do almost anything with AutoIt.

It depends in what way you want to compare the 2 numbers. There are many different choices... A-B, thats a difference. You might want to compare each digit individually.

Example

A = 16777215167772081677721513668432
B = 16777215167772081473348016312512

Comparison = 0000000000000000020427503356120

Digits are the same in both numbers represented by a 0, and ones that arnt I minused the smallest number out of the digits.

As I said before it depends by what means you want to compare them.

[Coolsurfer]

You can do almost anything with AutoIt.

It depends in what way you want to compare the 2 numbers. There are many different choices... A-B, thats a difference. You might want to compare each digit individually.

Example

A = 16777215167772081677721513668432
B = 16777215167772081473348016312512

Comparison = 0000000000000000020427503356120

Digits are the same in both numbers represented by a 0, and ones that arnt I minused the smallest number out of the digits.

As I said before it depends by what means you want to compare them.

<{POST_SNAPBACK}>

I've done A-B but Auto-it did not notice the difference. When I subtracted one from the other all it returns is 0. All I need is a method that shows a difference for an If-Then statement.

[buzz44]

I've done A-B but Auto-it did not notice the difference. When I subtracted one from the other all it returns is 0. All I need is a method that shows a difference for an If-Then statement.

<{POST_SNAPBACK}>

$a = 16777215167772081677721513668432
$b = 16777215167772081473348016312512
$c = $a - $b
Msgbox(0,"test",$c)

Works for me.

And.

$a = 16777215167772081677721513668432
$b = 16777215167772081473348016312512

If $a = $b Then
   Msgbox(0,"Same","The 2 numbers are the same!")
Else
   Msgbox(0,"Diff","The 2 numbers are different!" & @CRLF & "Difference: " & $a - $b)
EndIf

Edited April 30, 2005 by Burrup

[Coolsurfer]

$a = 16777215167772081677721513668432
$b = 16777215167772081473348016312512
$c = $a - $b
Msgbox(0,"test",$c)

Works for me.

And.

$a = 16777215167772081677721513668432
$b = 16777215167772081473348016312512

If $a = $b Then
   Msgbox(0,"Same","The 2 numbers are the same!")
Else
   Msgbox(0,"Diff","The 2 numbers are different!" & @CRLF & "Difference: " & $a - $b)
EndIf

<{POST_SNAPBACK}>

Why does the addition of the array change things?

$a = 16777215167772081677721513668432

$b = 16777215167772081473348016312512

Dim $c[2]

$c[0] = $a

$c[1] = $b

If $a = $b Then

Msgbox(0,"Same","The 2 numbers are the same!(a andb)")

Else

Msgbox(0,"Diff","The 2 numbers are different!")

EndIf

If $c[0] = $c[1] Then

Msgbox(0,"Same","The 2 numbers are the same!c[]")

Else

Msgbox(0,"Diff","The 2 numbers are different!")

EndIf

Edited April 30, 2005 by Coolsurfer

[buzz44]

It doesn't for me... Both return "The 2 numbers are different!", are you sure you have a latest BETA or 3.1.1 stable version.

[VicTT]

Why does the addition of the array change things?

$a = 16777215167772081677721513668432

$b = 16777215167772081473348016312512

Dim $c[2]

$c[0] = $a

$c[1] = $b

If $a = $b Then

  Msgbox(0,"Same","The 2 numbers are the same!(a andb)")

Else

  Msgbox(0,"Diff","The 2 numbers are different!")

EndIf

If $c[0] = $c[1] Then

  Msgbox(0,"Same","The 2 numbers are the same!c[]")

Else

  Msgbox(0,"Diff","The 2 numbers are different!")

EndIf

<{POST_SNAPBACK}>

You didn't quite get me..you declare yourself an array a2..and each element is a digit of a..so a[1]=1, a[2]=6 aso ... a[32]=3 a[33]=2..and then you would build a funct. that would substract b2, array built using the same method from a2..If it's only addition and that substraction, it's pretty easy..

[Coolsurfer]

It doesn't for me... Both return "The 2 numbers are different!", are you sure you have a latest BETA or 3.1.1 stable version.

<{POST_SNAPBACK}>

version is old, so I'll get the new one and let you know.

[VicTT]

Ok..that was REALLY vague..sorry..I'm really tired..

a2=123456

b2=789012

;Substract b2 from a2 digit by digit, starting from the end..

That's easy to implement..

and a2 and b2 are arrays..

Edited April 30, 2005 by VicTT

[buzz44]

It worked correctly. 1st message box, "The 2 numbers are the same!", 2nd, "The 2 numbers are different!". Tested with BETA 3.1.1.18