see example below. I was either expecting it to be 1 or 249 if we account for the whole bits in the byte type.

I read the sources but I can't figure out why I am not able to grasp it.

byte num1 = 6;
byte num2 = 12;
Assert.IsTrue(~num1 == 1);
Assert.IsTrue(~num2 == 3);

CodePudding user response：

~ operator converts type to int. If you want byte - use cast:

byte num1 = 6;
byte num2 = 12;
Console.WriteLine((byte)~num1);
Console.WriteLine((byte)~num2);

CodePudding user response：

When doing bitwise operation, you can use the following method to print the bits. In addition, the compiler gives an error Argument 1: cannot convert from 'int' to 'byte' when no byte conversion is done.

using System;
                    
public class Program
{
    public static string GetBitsAsString(byte b)
    {
        return Convert.ToString(b, 2).PadLeft(8, '0');
    }
    
    public static void Main()
    {
        byte num1 = 6, num2 = 12;
        Console.WriteLine(GetBitsAsString(num1)   "\t"   GetBitsAsString(num2));
        Console.WriteLine(GetBitsAsString((byte)~num1)   "\t"   GetBitsAsString((byte)~num2));
    }
}

This code produces the following output:

00000110    00001100
11111001    11110011

References

• Byte to Binary String C# - Display all 8 digits