This topic has not yet been rated - Rate this topic

BigInteger.Multiply Method

.NET Framework 4

Other Versions

Returns the product of two BigInteger values.

Namespace: System.Numerics
Assembly: System.Numerics (in System.Numerics.dll)

Syntax

C++

Copy

public static BigInteger Multiply(
	BigInteger left,
	BigInteger right
)

Parameters

left: Type: System.Numerics.BigInteger
The first number to multiply.

right: Type: System.Numerics.BigInteger
The second number to multiply.

Return Value

Type: System.Numerics.BigInteger
The product of the left and right parameters.

Remarks

The Multiply method is implemented for languages that do not support operator overloading. Its behavior is identical to multiplication using the multiplication operator. In addition, the Multiply method is a useful substitute for the multiplication operator when instantiating a BigInteger variable by assigning it a product that results from multiplication, as shown in the following example.

Copy


// The statement
//    BigInteger number = Int64.MaxValue * 3;
// produces compiler error CS0220: The operation overflows at compile time in checked mode.
// The alternative:
BigInteger number = BigInteger.Multiply(Int64.MaxValue, 3);

If necessary, this method automatically performs implicit conversion of other integral types to BigInteger objects. This is illustrated in the example in the next section, where the Multiply method is passed two Int64 values.

Examples

The following example tries to perform multiplication with two long integers. Because the result exceeds the range of a long integer, an OverflowException is thrown, and the Multiply method is called to handle the multiplication. Note that C# requires that you use either the checked keyword (as in this example) or the /checked+ compiler option to make sure an exception is thrown on a numeric overflow.

Copy


long number1 = 1234567890;
long number2 = 9876543210;
try
{
   long product; 
   product = checked(number1 * number2);
}
catch (OverflowException)
{
   BigInteger product;
   product = BigInteger.Multiply(number1, number2);
   Console.WriteLine(product.ToString());
   }

Version Information

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

BigInteger Structure

System.Numerics Namespace

Multiply

Did you find this helpful? Yes No

Not accurate

Not enough depth

Need more code examples

(1500 characters remaining)

Community Content Add

FAQ

BigInteger Multiply Method Sample using PowerShell

<#
.SYNOPSIS
    This script re-implements this MSDN Sample of 
    multiplying a big integer.
.DESCRIPTION
    This script first tries and fails to multiple a pair of large integers. The
    script catches the error and then used BigInteger.Multiply to multiply 
    the two big itegers.
.NOTES
    File Name  : Get-MultiplyBigInteger.ps1
    Author     : Thomas Lee - tfl@psp.co.uk
    Requires   : PowerShell Version 2.0
.LINK
    This script posted to:
        http://www.pshscripts.blogspot.com
    MSDN Sample posted at:
        http://msdn.microsoft.com/en-us/library/system.numerics.biginteger.multiply.aspx
.EXAMPLE
    PSH [C:\foo]: .Get-MultiplyBigInteger.ps1
    Too big for long, try biginteger
    12,193,263,111,263,526,900
#>
# Add System.Numerics namespace
$r=[system.Reflection.Assembly]::LoadWithPartialName("System.Numerics")

# Two big numbers
$number1 = 1234567890
$number2 = 9876543210

# Try normal [long] then catch error and do biginteger
try
{
   [long] $product = $number1 * $number2
}
catch 
{  "Too big for long, try biginteger"
   $product = New-Object System.Numerics.BigInteger
   $product = [System.Numerics.BigInteger]::Multiply($number1, $number2)
   $product.ToString("N0")
}

History

8/3/2010
Thomas Lee