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C++ Interview Questions and Answers

Ques 36. What are 2 ways of exporting a function from a DLL?

Ans. 1.Taking a reference to the function from the DLL instance.
2. Using the DLL ?s Type Library

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Ques 37. What is the difference between an object and a class?
Ans.
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 lifetime, the attributes of the object may undergo significant change.
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Ques 38. Suppose that data is an array of 1000 integers. Write a single function call that will sort the 100 elements data [222] through data [321].
Ans.
quicksort ((data + 222), 100);

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Ques 39. What is a class?
Ans.
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 specifics of the working of a class.
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Ques 40. What is friend function?
Ans.
As the name suggests, the function acts as a friend to a class. As a friend of a class, it can access its private and protected members. A friend function is not a member of the class. But it must be listed in the class definition.
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2) What is the difference between an object and a class? 3) Suppose that data is an array of 1000 integers. Write a single function call that will sort the 100 elements data [222] through data [321]. 4) What is a class? 5) What is friend function? " />

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