Get-MultiplyBigInteger.ps1

1. <# 
2. .SYNOPSIS 
3.     This script re-implements this MSDN Sample of  
4.     multiplying a big integer. 
5. .DESCRIPTION 
6.     This script first tries and fails to multiple a pair of large integers. The 
7.     script catches the error and then used BigInteger.Multiply to multiply  
8.     the two big itegers. 
9. .NOTES 
10.     File Name  : Get-MultiplyBigInteger.ps1 
11.     Author     : Thomas Lee - tfl@psp.co.uk 
12.     Requires   : PowerShell Version 2.0 
13. .LINK 
14.     This script posted to: 
15.         http://www.pshscripts.blogspot.com 
16.     MSDN Sample posted at: 
17.         http://msdn.microsoft.com/en-us/library/system.numerics.biginteger.multiply.aspx 
18. .EXAMPLE 
19.     PSH [C:\foo]: .Get-MultiplyBigInteger.ps1 
20.     Too big for long, try biginteger 
21.     12,193,263,111,263,526,900 
22. #> 
23. # Add System.Numerics namespace 
24. $r=[system.Reflection.Assembly]::LoadWithPartialName("System.Numerics") 
25.  
26. # Two big numbers 
27. $number1 = 1234567890 
28. $number2 = 9876543210 
29.  
30. # Try normal [long] then catch error and do biginteger 
31. try 
32. { 
33.    [long] $product = $number1 * $number2 
34. } 
35. catch  
36. {  "Too big for long, try biginteger" 
37.    $product = New-Object System.Numerics.BigInteger 
38.    $product = [System.Numerics.BigInteger]::Multiply($number1, $number2) 
39.    $product.ToString("N0") 
40. }    

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