gs gs108 Object Oriented Concepts - Inheritance Implementation - Quiz No.1

gs gs108 CSharp Quiz

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Question 1: What will be the output of the following C# code?

 class sample { public  int i; void display() { Console.WriteLine(i); } } class sample1 : sample { public  int j; public void display() { Console.WriteLine(j); } } class Program { static void Main(string[] args) { sample1 obj = new sample1(); obj.i = 1; obj.j = 2; obj.display(); Console.ReadLine(); } }

Compile Time error

Question 2: What will be the Correct statement in the following C# code?

 class sample { protected int index; public sample() { index = 0; } } class sample 1: sample { public void add() { index += 1; } } class Program { static void Main(string[] args) { sample 1 z = new sample 1(); z . add(); } }

Index should be declared as protected if it is to become available in inheritance chain

Constructor of sample class does not get inherited in sample 1 class

During constructing an object referred to by z, Firstly constructor of sample class will be called followed by constructor of sample 1 class

All of the mentioned

Question 3: The following C# code is run on single level of inheritance. What will be the Correct statement in the following C# code?

 class sample { int i = 10; int j = 20; public void display() { Console.WriteLine("base method "); } } class sample1 : sample { public  int s = 30; } class Program { static void Main(string[] args) { sample1 obj = new sample1(); Console.WriteLine("{0}, {1}, {2}", obj.i,  obj.j,  obj.s); obj.display(); Console.ReadLine(); } }

10, 20, 30 base method

10, 20, 0

compile time error

base method

Question 4: What will be size of the object created depicted by C# code snippet?

 class baseclass { private int a; protected int b; public int c; } class derived : baseclass { private int x; protected int y; public int z; } class Program { static Void Main(string[] args) { derived a = new derived(); } }

20 bytes

12 bytes

16 bytes

24 bytes

Question 5: What will be the output of the following C# code?

 class sample { public sample() { Console.WriteLine("THIS IS BASE CLASS constructor"); } } public class sample1 : sample {  } class Program { static void Main(string[] args) { sample1 obj = new sample1(); Console.ReadLine(); } }

Code executes successfully prints nothing

This is base class constructor

Compile time error

None of the mentioned

Question 6: Select the statement which should be added to the current C# code to get the output as 10 20?

 class baseclass { protected int a = 20; } class derived : baseclass { int a = 10; public void math() { /* add code here */ } }

Console.writeline( a + ” ” + this.a);

Console.Writeline( mybase.a + ” ” + a);

console.writeline(a + ” ” + base.a);

console.writeline(base.a + ” ” + a);

Question 7: What will be the Correct statement in the following C# code?

 class baseclass { int a; public baseclass(int a1) { a = a1; console.writeline(" a "); } class derivedclass : baseclass { public derivedclass (int a1) : base(a1) { console.writeline(" b "); } } class program { static void main(string[] args) { derivedclass d =  new derivedclass(20); } } }

Compile time error

b a

a b

The program will work correctly if we replace base(a1) with base.baseclass(a1)

Question 8: Which C# statement should be added in function a() of class y to get output “i love csharp”?

 class x { public void a() { console.write("bye"); } } class y : x { public void a() { /* add statement here */ console.writeline("  i love csharp "); } } class program { static void main(string[] args) { y obj =  new obj(); obj.a(); } }

x.a();

a();

base.a();

x::a();

Question 9: Which statements are correct?

If a base class consists of a member function fun() and a derived class do not have any function with this name. An object of derived class can access fun()

A class D can be derived from class C, which is derived from class B which in turn is derived from class A

If a base class and a derived class each include a member function with same name, the member function of the derived class will be called by object of derived class

All of the mentioned

Question 10: What will be the output of the following C# code?

 class A { public int i; protected int j; } class B : A { public int j; public void display() { base.j = 3; Console.WriteLine(i + " " + j); } } class Program { static void Main(string[] args) { B obj = new B(); obj.i = 1; obj.j = 2; obj.display(); Console.ReadLine(); } }

2 1

1 0

0 2

1 2