Jcd.BitManipulation

Jcd.BitManipulation.Algorithms.UInt64AlgorithmsExtensions

UInt64AlgorithmsExtensions.AreOnlyFirstAndLastBitsSet(this ulong) Method

Determines if only the lowest bit and one other higher bit are set.

public static bool AreOnlyFirstAndLastBitsSet(this ulong number);

Parameters

number System.UInt64

The number to evaluate.

Returns

System.Boolean true if the bitwise representation follows this pattern: 0b10..01. with any number of intervening zeros.

Example

ulong v = 0b0001;
Console.WriteLine($"{v.AreOnlyFirstAndLastBitsSet()}"); // outputs: True

v = 0b0011;
Console.WriteLine($"{v.AreOnlyFirstAndLastBitsSet()}"); // outputs: True

v = 0b0101;
Console.WriteLine($"{v.AreOnlyFirstAndLastBitsSet()}"); // outputs: True

v = 0b0111;
Console.WriteLine($"{v.AreOnlyFirstAndLastBitsSet()}"); // outputs: False