Is a constructor necessary?

A constructor is a special method of a class that initializes new objects or instances of the class. Without a constructor, you can’t create instances of the class . Imagine that you could create a class that represents files, but without constructors, you couldn’t create any files based on the class.

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What is argument in constructor?

It is used to prevent a specific constructor from being called implicitly when constructing an object . For example, without the explicit keyword, the following code is valid C++: Array a = 10; This will call the Array single-argument constructor with the integer argument of 10.

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