Question

Object Oriented Programming

Question 5

(a) Brieflfly explain the role of a constructor in C++?

[3 marks]

(b) Can you create instance of a class without a constructor defifined in source code?

Brieflfly explain your answer.

[3 marks]

(c) Objects model state and exhibit behaviour. Explain how state and behaviour are

implemented in C++.

[2 marks]

[Total for Question 5: 8 marks]

Answer 1

(a) Brieflfly explain the role of a constructor in C++?

Ans) Constructor is used to initialize the instance variables of a class.As we cant assign the values to the instance variables directly.So we have to use constructor.

The name of the constructor and the class name must be exactly same.It has no return type.

We have two types of constructor

1.Default constructor or Zero argumented constructor.

2. Parameterized constructor

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(b) Can you create instance of a class without a constructor defifined in source code?

Brieflfly explain your answer.

Ans) If we didnt specify the constructor in a class ,we can create the instance of the class.

As we didnt specifed any constructor in the class.The C++ compiler will create the zero argumented constructor.

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(c)

Objects model state and exhibit behaviour. Explain how state and behaviour are

implemented in C++.

Ans) We create instance variables and methods inside the class.

The instance variables are used to store the state of the object and functions are used to descibe the behaviour of the object.

________________________________Thank You