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C# | Inverting all bit values in BitArray

C# | Inverting all bit values in BitArray

Last Updated : 11 Jul, 2025

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.Not

method

inverts all the bit values

in the current BitArray, so that elements set to

true

are changed to

false

, and elements set to

false

are changed to

true

.

Properties: Syntax:
public System.Collections.BitArray Not ();
Return Value:

It returns the current instance with inverted bit values.

Example: CSHARP
// C# code to invert values in 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[1] = true;
        myBitArr2[2] = false;
        myBitArr2[3] = true;

        // Function calling to print the values
        // of BitArray myBitArr1
        Console.WriteLine("Values in BitArray myBitArr1 are : ");

        PrintValues(myBitArr1);

        // Function calling to print the values
        // of BitArray myBitArr2
        Console.WriteLine("Values in BitArray myBitArr2 are : ");

        PrintValues(myBitArr2);

        // inverting values in BitArray myBitArr1
        myBitArr1.Not();

        // inverting values in BitArray myBitArr2
        myBitArr2.Not();

        // Function calling to print the inverted values
        // of BitArray myBitArr1
        Console.WriteLine("Values in BitArray myBitArr1 are : ");

        PrintValues(myBitArr1);

        // Function calling to print the inverted values
        // of BitArray myBitArr2
        Console.WriteLine("Values in BitArray myBitArr2 are : ");

        PrintValues(myBitArr2);
    }

    // Displaying the result
    public static void PrintValues(IEnumerable myList)
    {
        foreach(Object obj in myList)
        {
            Console.WriteLine(obj);
        }
    }
}
Output:
Values in BitArray myBitArr1 are : 
False
False
True
True
Values in BitArray myBitArr2 are : 
False
True
False
True
Values in BitArray myBitArr1 are : 
True
True
False
False
Values in BitArray myBitArr2 are : 
True
False
True
False
Note:

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

Reference:

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