ExamAdept

Which of the following statements is correct about Bitwise | operator used in C#.NET?

A:

The | operator can be used to put OFF a bit.

B:

The | operator can be used to Invert a bit.

C:

The | operator can be used to check whether a bit is ON.

D:

The | operator can be used to check whether a bit is OFF.

Answer: E

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What will be the output of the C#.NET code snippet given below?

byte b1 = 0xAB;
byte b2 = 0x99;
byte temp;
temp = (byte)~b2;
Console.Write(temp + " ");
temp = (byte)(b1 << b2);
Console.Write (temp + " ");
temp = (byte) (b2 >> 2);
Console.WriteLine(temp);

A:

102 1 38

B:

108 0 32

C:

102 0 38

D:

1 0 1

Answer: C

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Suppose n is a variable of the type Byte and we wish to put OFF its fourth bit (from right) without disturbing any other bits. Which of the following statements will do this correctly?

A:

n = n && HF7

B:

n = n & 16

C:

n = n & 0xF7

D:

n = n & HexF7

Answer: C

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What will be the output of the C#.NET code snippet given below?

int num = 1, z = 5;

if (!(num <= 0))
    Console.WriteLine( ++num + z++ + " " + ++z ); 
else
    Console.WriteLine( --num + z-- + " " + --z );

A:

5 6

B:

6 5

C:

6 6

D:

7 7

Answer: D

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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");

Answer: B

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.

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Questions for: Operators