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kaasknak

factorial problems

7 posts in this topic

I am currently busy on a script that is supposed to be used for calculating the factorials of given numbers this is the current script.

$faculteit = faculteit(26)
msgbox (0, "", $faculteit)

Func faculteit($nummer)
Local $n = 1

For $i = 1 to $nummer
$n = $n*$i
Next

If $n = 0 Then
SetError ( 1 )
Return 1
Else
Return $n
EndIf
EndFunc

The problem is this works fine until it goes up to 26! then the numbers start going all wrong.

Anybody know what's causing this problem?

Thanks for your time

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kaasknak,

At a guess you have reached the upper limit for integers. ;)

There is a BigNum UDF somewhere on the forum which might be helpful. :)

M23


Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind._______My UDFs:

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ArrayMultiColSort ---- Sort arrays on multiple columns
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Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
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You can also do:

Local $n = 1.0
... and then do calculation.


♡♡♡

.

eMyvnE

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The last option worked.

Thanks

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What is the upper bound of the integers you're going to need factorial?

Which accuracy do your application need?


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Are you sure you get to 26! without problems? Log_2(26!) is 89, which is far larger than the largest AutoIt integers. The highest you should be able to do is 20!.

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Indeed!

In[1]:={20!, 263 - 1, 264 - 1, 26!}

Out[1]={

2432902008176640000 ; 20!

9223372036854775807 ; max signed int64

18446744073709551615 ; max unsigned int64

403291461126605635584000000 ; 26!

}

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This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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