(2006-05-17) Large Integers And VBS Or BATCH

For a script I was writing, I needed to work with large integers.

 

Example code in VBS was to compare very large numeric numbers:

Dim LargestValue
LargestValue=0
AR = Array("134234","22342399999999999994","9","555555555577698","6","5")
For l = 0 to UBound(AR)
    If LargestValue < Int(AR(l)) then
       LargestValue = Int(AR(l))
    End If
Next
wscript.echo LargestValue

As you can see 22342399999999999994 is the largest value and it should be returned as such. Well it does, almost…

However, it does not say (and that is what I would like!):

22342399999999999994

but it says:

2.23424E+19

As soon as a numeric value gets a certain size it converts it to x.xxxxE+y

Example code in VBS was to compare very large numeric numbers:

@ECHO OFF
CLS
SETLOCAL ENABLEDELAYEDEXPANSION
SET LargestValue=0
FOR /F %%I IN (NUMBERS.TXT) DO (
 IF /I !LargestValue! LSS %%I (
  SET LargestValue=%%I
 )
)
ECHO !LargestValue!

In this case it does return the largest value as I want…

So I thought, lets do it in batch. So before continuing I thought "let’s do another test of creating an addition of very large numbers". The code would look like:

@ECHO OFF
CLS
SETLOCAL ENABLEDELAYEDEXPANSION
SET NUMBER1=4611689999999999999
SET NUMBER2=500000
SET /A NUMBERTOTAL=%NUMBER1% ++ %NUMBER2%
ECHO %NUMBERTOTAL%

now guess what the output was!….

it was:

Invalid number.  Numbers are limited to 32-bits of precision.

 

Cheers,

Jorge

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