a2zinterviews

61.	What is a class?
	Class is a user defined data type in C++. It can be created to solve a particular kind of problem. After creation the user need not know the specifies of the working of a class.
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62.	What is the difference between an object and a class?
	Classes and objects are separate but related concepts. Every object belongs to a class and every class contains one or more related objects. A Class is static. All of the attributes of a class are fixed before, during, and after the execution of a program. The attributes of a class don't change. The class to which an object belongs is also (usually) static. If a particular object belongs to a certain class at the time that it is created then it almost certainly will still belong to that class right up until the time that it is destroyed. An object on the other hand has a limited lifespan. Objects are created and eventually destroyed. Also during that life lifetime, the attributes of the objects may undergo significant change.
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63.	What is abstraction?
	Abstraction is of the process of hiding unwanted details from the user.
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64.	What is the difference between new() and calloc()?
	new () allocates continous space for the object instance malloc() allocates distributed space. new() is castles, meaning that allocates memory for this specific type, malloc(), calloc() allocates space for void * that is created to the specific class type pointer.
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65.	What is difference between class and structure?
	Structure: Initially (in C) a structure was used to bundle different types together to perform a particular functionality. But C++ extended the structure to contain functions also. The major difference is that all declarations inside a structure are by default public. Class: class is a successor of Structures. By default all the members inside the class are private.
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