php mcq questions with answers


                                
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");
                              
Click To Show Ans:B

                        
                                


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
                              
Click To Show Ans:D

                        
                                
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
E.n = n & 8
                              
Click To Show Ans:C

                        
                                


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
                              
Click To Show Ans:C

                        
                                
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.
E.The | operator can be used to put ON a bit.
                              
Click To Show Ans:E