C# | Set all bits in the BitArray to the specified value

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.SetAll(Boolean) method is used to set all bits in the BitArray to the specified value.

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 void SetAll (bool value);

Here, value is the Boolean value to assign to all bits.

Note: This method is an O(n) operation, where n is Count.

Below programs illustrate the use of BitArray.SetAll(Boolean) method:

Example 1:

// C# code to set all bits in the
// BitArray to the specified value
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a BitArray myBitArr
        // Initializing all the values to false
        BitArray myBitArr = new BitArray(5, false);

        // Printing the values in myBitArr
        // It should display all the bits as false
        Console.WriteLine("Initially the bits are as : ");

        PrintIndexAndValues(myBitArr);

        // Setting all bits to true
        myBitArr.SetAll(true);

        // Printing the values in myBitArr
        // It should display all the bits as true
        Console.WriteLine("Finally the bits are as : ");

        PrintIndexAndValues(myBitArr);
    }

    // Function to display bits
    public static void PrintIndexAndValues(IEnumerable myArr)
    {
        foreach(Object obj in myArr)
        {
            Console.WriteLine(obj);
        }
    }
}

Output:

Initially the bits are as : 
False
False
False
False
False
Finally the bits are as : 
True
True
True
True
True

Example 2:

// C# code to set all bits in the
// BitArray to the specified value
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a BitArray myBitArr
        BitArray myBitArr = new BitArray(5);

        // Initializing all the bits in myBitArr
        myBitArr[0] = false;
        myBitArr[1] = true;
        myBitArr[2] = true;
        myBitArr[3] = false;
        myBitArr[4] = true;

        // Printing the values in myBitArr
        Console.WriteLine("Initially the bits are as : ");

        PrintIndexAndValues(myBitArr);

        // Setting all bits to false
        myBitArr.SetAll(false);

        // Printing the values in myBitArr
        // It should display all the bits as false
        Console.WriteLine("Finally the bits are as : ");

        PrintIndexAndValues(myBitArr);
    }

    // Function to display bits
    public static void PrintIndexAndValues(IEnumerable myArr)
    {
        foreach(Object obj in myArr)
        {
            Console.WriteLine(obj);
        }
    }
}

Output:

Initially the bits are as : 
False
True
True
False
True
Finally the bits are as : 
False
False
False
False
False

Reference:

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