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Operators - Programming

Q1:

Suppose n is a variable of the type Byte and we wish, to check whether its fourth bit (from right) is ON or OFF. Which of the following statements will do this correctly?

A 
if ((n&16) == 16)
Console.WriteLine("Fourth bit is ON");

B 
if ((n&8) == 8)
Console.WriteLine("Fourth bit is ON");

C if ((n ! 8) == 8) Console.WriteLine("Fourth bit is ON");

D if ((n ^ 8) == 8) Console.WriteLine("Fourth bit is ON");

E if ((n ~ 8) == 8) Console. WriteLine("Fourth bit is ON");

ANS:B - 

if ((n&8) == 8)
Console.WriteLine("Fourth bit is ON");

byte myByte = 153; // In Binary = 10011001

byte n = 8; // In Binary = 00001000 
(Here 1 is the 4th bit from right)

Now perform logical AND operation (n & myByte)

 10011001
 00001000
---------
 00001000  Here result is other than 0, so evaluated to True.
---------
If the result is true, then we can understand that 4th bit is ON of the given data myByte.