C# Constructors and Destructors Aptitude Questions and Answers

1. Constructors are not required in a class.
2. Constructors are used to initializing data members of the class.
3. The constructor name and class name must be the same.
4. Contractors are old technique, now a day they are deprecated.

Options:

1. Only A
2. Only D
3. B and C
4. A and D

1. A constructor does not have any return type.
2. Constructors can be overloaded.
3. Constructors cannot be overloaded.
4. A constructor is called when an object of the class gets created.

Options:

1. Only A
2. Only B
3. Only C
4. Only D

1. Method
2. Class
3. Variable
4. Keyword

1. Yes
2. No

1. Yes
2. No

1. It depends upon the setting in Visual studio.
2. Any number of times it can be called by the programmer explicitly.
3. Only One time.
4. 2 times only.

1. Yes
2. No

1. Default Constructor
2. Copy Constructor
3. Parameterized constructor
4. Body Constructor

1. A constructor is used to write code in a simple manner.
2. A class can contain multiple destructors.
3. A constructor is basically used to set default values in data members associated with an object.
4. A copy constructor is used in C#.NET

Opyions:

1. Only A
2. C and D
3. Only C
4. Only D

1. Yes
2. No

1. Default constructor
2. Copy constructor
3. Destructor
4. Super constructor

1. A destructor is a special type of method, it automatically invokes when an object of the class gets destroyed.
2. We need to use a tilde (~) operator to define a destructor.
3. A destructor is used to reload the data member's value.
4. We can create multiple destructors in a class.

Options:

1. Only A
2. A and B
3. Only C
4. C and D

1. Yes
2. No

1. Void
2. Integer
3. It does not have any return type
4. It returns an object of the structure

using System;

public class Example
{

    int X;
    int Y;

    public static Example()
    {
        X = 10;
        Y = 10;
    }

    public void show()
    {
        Console.WriteLine(X + " " + Y);
    }
    
    static void Main(string[] args)
    {
        Example Ob = new Example();
        Ob.show();
    }
}

1. 10 10
2. 1o 1o
3. Runtime Exception
4. Syntax Error

using System;

public class Example
{
    int X;
    int Y;

    public example()
    {
        X = 10;
        Y = 10;
    }

    public void show()
    {
        Console.WriteLine(X + " " + Y);
    }
    
    static void Main(string[] args)
    {
        Example Ob = new Example();
        Ob.show();
    }
}

1. 10 10
2. 1o 1o
3. Runtime Exception
4. Syntax Error

public class Example
{
    int X;
    int Y;

    public Example(int x, int y)
    {
        X = x;
        Y = y;
    }
}

1. Example E = new Example();
2. Example E = Example(10,20);
3. Example E = new Example(10,20);
4. Example E(10,20);

Employee E1 = new Employee ("Shaurya");
Employee E2 = new Employee ("Shaurya", 5);

Code 1:

public Employee(string n)
{
	name = n;
	age = 5;
}
public Employee(string n, int a)
{
	name = n;
	age = a;
}

Code 2:

public Employee(int a)
{
	name = "shaurya";
	age = a;
}
public Employee(string n, int a)
{
	name = n;
	age = a;
}

Code 3:

public Employee()
{
	name = "shaurya";
	age = 5;
}
public Employee(string n, int a)
{
	name = n;
	age = a;
}

Code 4:

public Employee(int a)
{
	name = "shaurya";
	age = a;
}
public Employee(int n, sting a)
{
	name = n;
	age = a;
}

1. Code 1
2. Code 2
3. Code 3
4. Code 4

1. Yes
2. No

1. Yes
2. No

1. Yes
2. No

1. A copy constructor is an old technique, it is deprecated nowadays.
2. A copy constructor is not supported in C#.NET.
3. A copy constructor is used to initialize an object from an existing object.
4. A copy constructor is also known as a no-argument constructor.

Options:

1. Only A
2. Only B
3. C and D
4. Only C

1. Default constructor
2. Parameterized constructor
3. Copy constructor
4. Body constructor

using System;

class Employee
{
    string name;
    int age;

    public Employee()
    {
        name = "shaurya";
        age = 5;
    }

    public Employee(Employee E)
    {
        name = E.name;
        age =  E.age;
    }

    public void show()
    {
        Console.WriteLine(name + " " + age);
    }

    static void Main(string[] args)
    {
        Employee e1 = new Employee();
        Employee e2 = new Employee(e1);

        e1.show();
        e2.show();
    }
}

1. shaurya 5
   shaurya 5
2. shaurya
   shaurya
3. Runtime Exception
4. Syntax Error

using System;

class Employee
{
    string name;
    int age;

    public Employee()
    {
        this.name = "shaurya";
        age = 5;
    }

    public Employee(Employee E)
    {
        name = E.name;
        this.age =  E.age;
    }

    public void show()
    {
        Console.WriteLine(name + " " + age);
    }

    static void Main(string[] args)
    {
        Employee e1 = new Employee();
        Employee e2 = new Employee(e1);

        e1.show();
        e2.show();
    }
}

1. shaurya 5
   shaurya 5
2. shaurya
   shaurya
3. Runtime Exception
4. Syntax Error