C# | Bitwise OR operation between the elements of BitArray

The BitArray class manages a compact array of bit values, which are represented as Booleans, where true indicates that the bit is on i.e, 1 and false indicates the bit is off i.e, 0. This class is contained in System.Collections namespace.
BitArray.Or(BitArray) method is used to perform the bitwise OR operation between the elements of the current BitArray object and the corresponding elements in the specified array. The current BitArray object will be modified to store the result of the bitwise OR operation.

Properties:

• The BitArray class is a collection class in which the capacity is always the same as the count.
• Elements are added to a BitArray by increasing the Length property.
• Elements are deleted by decreasing the Length property.
• Elements in this collection can be accessed using an integer index. Indexes in this collection are zero-based.

Syntax:

public System.Collections.BitArray Or (System.Collections.BitArray value);

Here, value is the array with which to perform the bitwise OR operation.

Return Value: It returns an array containing the result of the bitwise OR operation, which is a reference to the current BitArray object.

Exceptions:

• ArgumentNullException: If the value is null.
• ArgumentException: If the value and the current BitArray do not have the same number of elements.

Below given are some examples to understand the implementation in a better way:

Example 1:

// C# code to do bitwise
// OR between BitArray
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a BitArray
        BitArray myBitArr1 = new BitArray(4);

        // Creating a BitArray
        BitArray myBitArr2 = new BitArray(4);

        // Initializing values in myBitArr1
        myBitArr1[0] = false;
        myBitArr1[1] = false;
        myBitArr1[2] = true;
        myBitArr1[3] = true;

        // Initializing values in myBitArr2
        myBitArr2[0] = false;
        myBitArr2[2] = false;
        myBitArr2[1] = true;
        myBitArr2[3] = true;

        // function calling
        PrintValues(myBitArr1.Or(myBitArr2));
    }

    // Displaying the result
    public static void PrintValues(IEnumerable myList)
    {
        foreach(Object obj in myList)
        {
            Console.WriteLine(obj);
        }
    }
}

Output:

False
True
True
True

Example 2:

// C# code to do bitwise
// OR between BitArray
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a BitArray
        BitArray myBitArr1 = new BitArray(4);

        // Creating a BitArray
        BitArray myBitArr2 = new BitArray(6);

        // Initializing values in myBitArr1
        myBitArr1[0] = false;
        myBitArr1[1] = false;
        myBitArr1[2] = true;
        myBitArr1[3] = true;

        // Initializing values in myBitArr2
        myBitArr2[0] = false;
        myBitArr2[2] = false;
        myBitArr2[1] = true;
        myBitArr2[3] = true;
        myBitArr2[4] = true;
        myBitArr2[5] = true;

        // function calling
        // This should raise "ArgumentException"
        // as array lengths are not same
        PrintValues(myBitArr1.Or(myBitArr2));
    }

    // Displaying the result
    public static void PrintValues(IEnumerable myList)
    {
        foreach(Object obj in myList)
        {
            Console.WriteLine(obj);
        }
    }
}

Runtime Error:

Unhandled Exception:
System.ArgumentException: Array lengths must be the same.

Note:

• The bitwise OR operation returns true if one or both operands are true, and returns false if both operands are false.
• This method is an O(n) operation, where n is Count.

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.collections.bitarray.or?view=netframework-4.7.2