Class BigIntegerExtensions

Math-related extension methods for .

Inheritance
System.Object
BigIntegerExtensions
Namespace: X10D.Math
Assembly: X10D.dll
Syntax
public static class BigIntegerExtensions : object

Methods

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CountDigits(BigInteger)

Returns the number of digits in the current integer.

Declaration
public static int CountDigits(this BigInteger value)
Parameters
Type Name Description
BigInteger value

The value whose digit count to compute.
Returns
Type Description
System.Int32

The number of digits in value.
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DigitalRoot(BigInteger)

Computes the digital root of this 8-bit integer.

Declaration
public static int DigitalRoot(this BigInteger value)
Parameters
Type Name Description
BigInteger value

The value whose digital root to compute.
Returns
Type Description
System.Int32

The digital root of value.
Remarks

The digital root is defined as the recursive sum of digits until that result is a single digit.

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Factorial(BigInteger)

Returns the factorial of the current 64-bit signed integer.

Declaration
public static BigInteger Factorial(this BigInteger value)
Parameters
Type Name Description
BigInteger value

The value whose factorial to compute.
Returns
Type Description
BigInteger

The factorial of value.
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GreatestCommonFactor(BigInteger, BigInteger)

Calculates the greatest common factor between this, and another, .

Declaration
public static BigInteger GreatestCommonFactor(this BigInteger value, BigInteger other)
Parameters
Type Name Description
BigInteger value

The first value.
BigInteger other

The second value.
Returns
Type Description
BigInteger

The greatest common factor between value and other.
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IsOdd(BigInteger)

Returns a value indicating whether the current value is not evenly divisible by 2.

Declaration
public static bool IsOdd(this BigInteger value)
Parameters
Type Name Description
BigInteger value

The value whose parity to check.
Returns
Type Description
System.Boolean

true if value is not evenly divisible by 2, or false otherwise.
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IsPrime(BigInteger)

Returns a value indicating whether the current value is a prime number.

Declaration
public static bool IsPrime(this BigInteger value)
Parameters
Type Name Description
BigInteger value

The value whose primality to check.
Returns
Type Description
System.Boolean

true if value is prime; otherwise, false.
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LowestCommonMultiple(BigInteger, BigInteger)

Calculates the lowest common multiple between the current 64-bit signed integer, and another 64-bit signed integer.

Declaration
public static BigInteger LowestCommonMultiple(this BigInteger value, BigInteger other)
Parameters
Type Name Description
BigInteger value

The first value.
BigInteger other

The second value.
Returns
Type Description
BigInteger

The lowest common multiple between value and other.
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Mod(BigInteger, BigInteger)

Performs a modulo operation which supports a negative dividend.

Declaration
public static BigInteger Mod(this BigInteger dividend, BigInteger divisor)
Parameters
Type Name Description
BigInteger dividend

The dividend.
BigInteger divisor

The divisor.
Returns
Type Description
BigInteger

The result of dividend mod divisor.
Remarks

The % operator (commonly called the modulo operator) in C# is not defined to be modulo, but is instead remainder. This quirk inherently makes it difficult to use modulo in a negative context, as x % y where x is negative will return a negative value, akin to -(x % y), even if precedence is forced. This method provides a modulo operation which supports negative dividends.

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MultiplicativePersistence(BigInteger)

Returns the multiplicative persistence of a specified value.

Declaration
public static int MultiplicativePersistence(this BigInteger value)
Parameters
Type Name Description
BigInteger value

The value whose multiplicative persistence to calculate.
Returns
Type Description
System.Int32

The multiplicative persistence.
Remarks

Multiplicative persistence is defined as the recursive digital product until that product is a single digit.

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Wrap(BigInteger, BigInteger)

Wraps the current integer between 0 and a high value.

Declaration
public static BigInteger Wrap(this BigInteger value, BigInteger length)
Parameters
Type Name Description
BigInteger value

The value to wrap.
BigInteger length

The exclusive upper bound.
Returns
Type Description
BigInteger

The wrapped value.
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Wrap(BigInteger, BigInteger, BigInteger)

Wraps the current integer between a low and a high value.

Declaration
public static BigInteger Wrap(this BigInteger value, BigInteger low, BigInteger high)
Parameters
Type Name Description
BigInteger value

The value to wrap.
BigInteger low

The inclusive lower bound.
BigInteger high

The exclusive upper bound.
Returns
Type Description
BigInteger

The wrapped value.