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How to split a 32‑bit integer into its four bytes in C#

1 Answer

0 votes
using System;

/*
    split_bytes(n)
    --------------
    Splits a 32-bit unsigned integer into its four bytes.

    Layout (little-endian order):
        byte[0] = lowest  8 bits
        byte[1] = next     8 bits
        byte[2] = next     8 bits
        byte[3] = highest  8 bits

    Uses bitwise AND and shifts:
        n & 0xFF        → extract lowest byte
        (n >> 8) & 0xFF → extract next byte
        ...
*/

class SplitBytesDemo
{
    public static byte[] split_bytes(uint n)
    {
        return new byte[]
        {
            (byte)(n & 0xFF),          // lowest byte
            (byte)((n >> 8) & 0xFF),
            (byte)((n >> 16) & 0xFF),
            (byte)((n >> 24) & 0xFF)   // highest byte
        };
    }

    /*
        print_bits(label, value)
        ------------------------
        Prints an 8-bit or 32-bit value in binary.

        Uses Convert.ToString(value, 2) and manual zero-padding.
    */
    public static void print_bits(string label, uint value, int bits)
    {
        string binary = Convert.ToString(value, 2);

        // Pad with leading zeros
        if (binary.Length < bits) {
            binary = new string('0', bits - binary.Length) + binary;
        }

        Console.WriteLine($"{label} ({bits} bits): {binary}");
    }

    static void Main()
    {
        uint value = 3298312;

        byte[] bytes = split_bytes(value);

        Console.WriteLine("Bytes (little-endian order):");
        for (int i = 0; i < bytes.Length; i++) {
            Console.WriteLine($"byte[{i}]: {bytes[i]}");
        }

        Console.WriteLine();
        Console.WriteLine("Bit representation:");

        // Print full 32-bit value
        print_bits("Full value", value, 32);

        // Print each byte in binary
        for (int i = 0; i < bytes.Length; i++) {
            print_bits($"byte[{i}]", bytes[i], 8);
        }
    }
}



/*
run:

Bytes (little-endian order):
byte[0]: 8
byte[1]: 84
byte[2]: 50
byte[3]: 0

Bit representation:
Full value (32 bits): 00000000001100100101010000001000
byte[0] (8 bits): 00001000
byte[1] (8 bits): 01010100
byte[2] (8 bits): 00110010
byte[3] (8 bits): 00000000

*/

 



answered Jul 20 by avibootz
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