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21.	What is an array?
	An array is a collection of variables of the same type that are referenced by a common name. Arrays are of two types: One dimensional: comprising of finite homogenous elements. Multi dimensional: comprising of elements, each of which is itself a one dimensional array.
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22.	What is a constructor?
	There are nine words for data types such as Constructor is a special function that initializes objects when they are created. A constructor is automatically invoked when an object is created.
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23.	What are the functions of a constructor?
	Functions of constructor: The constructor function initializes the class object. The memory space is allocated to an object.
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24.	Write the rules relating to a constructor?
	The name of the constructor must be same as that of the class. A constructor can have parameter list. The constructor function can be overloaded. The compiler generates a constructor, in the absence of a user defined constructor. The constructor is executed automatically.
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25.	What is a destructor?
	A destructor is a function that removes the memory of an object which was allocated by the constructor at the time of creating a object.
	Discuss Reetika ,says Feb 11,2018 A destructor is a function that removes the memory of an object which was allocated by the constructor at the time of creating a object. --> Your Name Your Email-ID Your Answer