C# | Set the bit at a specific position in the BitArray to the specified value

Last Updated : 01 Feb, 2019

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.Set(Int32, Boolean) method is used to set the bit at a specific position 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 Set (int index, bool value);

Parameters:

index : The zero-based index of the bit to set.
value : The Boolean value to assign to the bit.

Exception: This method will give ArgumentOutOfRangeException if the index is less than zero or the index is greater than or equal to the number of elements in the BitArray.

Note: This method is an O(1) operation.

Below programs illustrate the use of BitArray.Set(Int32, Boolean) Method:

Example 1:

// C# code to set the bit at
// a specific position 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 bit at index 3 to true
        myBitArr.Set(3, true);
  
        // Printing the values in myBitArr
        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 : 
False
False
False
True
False

Example 2:

// C# code to set the bit at
// a specific position 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 bit at index 2 to false
        myBitArr.Set(2, false);
  
        // Setting bit at index 3 to true
        myBitArr.Set(3, true);
  
        // Printing the values in myBitArr
        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
True
False
True
True

Reference:

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

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C# | Set the bit at a specific position in the BitArray to the specified value