using System;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        int n = 11100;

        n = SetBit(n, 2);

//      n = ClearBit(n, 2);

        n = UpdateBit(n, 2, 0);

        Console.WriteLine(GetBit(n, 2));

        PrintBinary(110);

    }

    static bool GetBit(int n, int i)

    {

        int mask = 1 << i;

        return ((n & mask) != 0);

    }

    static int SetBit(int n, int i)

    {

        return (n | (1 << i));

    }

    static int ClearBit(int n, int i)

    {

        int mask = ~(1 << i);

        return (n & mask);

    }

    static int ClearBitMsThroughI(int n, int i)

    {

        int mask = (1 << i) - 1;

        return n & mask;

    }

    static int ClearBitsIThrough0(int n, int i)

    {

        int mask = ~((1 << (i+1)) - 1);

        return n & mask;

    }

    static int UpdateBit(int n, int i, int v)

    {

        int mask = ~(1 << i);

        n = n & mask;

        mask = (v << i);

        return n | mask;

    }

    static void PrintBinary(int num)

    {

        //Input: 10

        //Output: 1010

        StringBuilder sb = new StringBuilder();

        while(num > 0)

        {

            int quotient = num / 2;

            int bit = num % 2;

            sb.Append(bit);

            num = quotient;

        }

        Console.WriteLine(sb.ToString());

    }

​

}