How to read and write bits in C#

Question

I have to write and read bits from int in my program. How to do it?

Alan · Answer

If performance is not a major consideration (as I'm using string conversions) then here are some easy to use bit functions written in C# : using System; class Bits { static void Main() { int i = 255; // or whatever string bits = ConvertToBits(i); Console.WriteLine(Bit representation of {0} is {1} i bits); int j = GetBit(i 1); Console.WriteLine(Bit 1 is {0} j); Console.WriteLine(Setting bit 1 to 0); SetBit(ref i 1 0); Console.WriteLine(i is now {0} i); bits = ConvertToBits(i); Console.WriteLine(Bit representation of {0} is {1} i bits); j = GetBit(i 2); Console.WriteLine(Bit 2 is {0} j); Console.WriteLine(Flipping bit 2); FlipBit(ref i 2); Console.WriteLine(i is now {0} i); bits = ConvertToBits(i); Console.WriteLine(Bit representation of {0} is {1} i bits); Console.ReadLine(); } public static string ConvertToBits(int i) { string bits = Convert.ToString(i 2); int len = bits.Length; if (len == 32) { return bits; } return new string('0' 32 - len) + bits; } public static int ConvertFromBits(string bits) { return Convert.ToInt32(bits 2); } public static int GetBit(int i int bitNum) { if (bitNum 31) return -1; // error value return ConvertToBits(i)[31 - bitNum] - 48; } public static void SetBit(ref int i int bitNum int value) { if (bitNum 31 || value 1) return; // i unchanged char[] bitArray = ConvertToBits(i).ToCharArray(); bitArray[31 - bitNum] = (char)(value + 48); i = Convert.ToInt32(new string(bitArray) 2); } public static void FlipBit(ref int i int bitNum) { if (bitNum 31) return; // i unchanged char[] bitArray = ConvertToBits(i).ToCharArray(); bitArray[31 - bitNum] = (bitArray[31 - bitNum] == '1') ? '0' : '1'; i = Convert.ToInt32(new string(bitArray) 2); } }

Raj Kumar · Answer

Hope this will help. http://local.wasp.uwa.edu.au/~pbourke/dataformats/bmp/BITMAP.C