Class Int64Extensions

Extension methods for .

Inheritance
System.Object
Int64Extensions
Namespace: X10D.Math
Assembly: X10D.dll
Syntax
public static class Int64Extensions : object

Methods

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CountDigits(Int64)

Returns the number of digits in the current 64-bit signed integer.

Declaration
public static int CountDigits(this long value)
Parameters
Type Name Description
System.Int64 value

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

The number of digits in value.
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DigitalRoot(Int64)

Computes the digital root of this 64-bit integer.

Declaration
public static long DigitalRoot(this long value)
Parameters
Type Name Description
System.Int64 value

The value whose digital root to compute.
Returns
Type Description
System.Int64

The digital root of value.
Remarks

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

For example, the digital root of 239 is 5: 2 + 3 + 9 = 14, then 1 + 4 = 5.

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Factorial(Int64)

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

Declaration
public static long Factorial(this long value)
Parameters
Type Name Description
System.Int64 value

The value whose factorial to compute.
Returns
Type Description
System.Int64

The factorial of value.
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GreatestCommonFactor(Int64, Int64)

Calculates the greatest common factor between the current 64-bit signed integer, and another 64-bit unsigned integer.

Declaration
public static long GreatestCommonFactor(this long value, long other)
Parameters
Type Name Description
System.Int64 value

The first value.
System.Int64 other

The second value.
Returns
Type Description
System.Int64

The greatest common factor between value and other.
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IsEven(Int64)

Returns a value indicating whether the current value is evenly divisible by 2.

Declaration
public static bool IsEven(this long value)
Parameters
Type Name Description
System.Int64 value

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

true if value is evenly divisible by 2, or false otherwise.
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IsOdd(Int64)

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

Declaration
public static bool IsOdd(this long value)
Parameters
Type Name Description
System.Int64 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(Int64)

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

Declaration
public static bool IsPrime(this long value)
Parameters
Type Name Description
System.Int64 value

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

true if value is prime; otherwise, false.
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LowestCommonMultiple(Int64, Int64)

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

Declaration
public static long LowestCommonMultiple(this long value, long other)
Parameters
Type Name Description
System.Int64 value

The first value.
System.Int64 other

The second value.
Returns
Type Description
System.Int64

The lowest common multiple between value and other.
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Mod(Int64, Int64)

Performs a modulo operation which supports a negative dividend.

Declaration
public static long Mod(this long dividend, long divisor)
Parameters
Type Name Description
System.Int64 dividend

The dividend.
System.Int64 divisor

The divisor.
Returns
Type Description
System.Int64

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(Int64)

Returns the multiplicative persistence of a specified value.

Declaration
public static int MultiplicativePersistence(this long value)
Parameters
Type Name Description
System.Int64 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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Sign(Int64)

Returns an integer that indicates the sign of this 64-bit signed integer.

Declaration
public static int Sign(this long value)
Parameters
Type Name Description
System.Int64 value

A signed number.
Returns
Type Description
System.Int32

A number that indicates the sign of value, as shown in the following table.

Return valueMeaning
-1value is less than zero.
0value is equal to zero.
1value is greater than zero.
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Wrap(Int64, Int64)

Wraps the current 64-bit signed integer between 0 and a high value.

Declaration
public static long Wrap(this long value, long length)
Parameters
Type Name Description
System.Int64 value

The value to wrap.
System.Int64 length

The exclusive upper bound.
Returns
Type Description
System.Int64

The wrapped value.
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Wrap(Int64, Int64, Int64)

Wraps the current 64-bit signed integer between a low and a high value.

Declaration
public static long Wrap(this long value, long low, long high)
Parameters
Type Name Description
System.Int64 value

The value to wrap.
System.Int64 low

The inclusive lower bound.
System.Int64 high

The exclusive upper bound.
Returns
Type Description
System.Int64

The wrapped value.