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Operator Overloading in C++ Interview Questions & Answers - Learning Mode

Operator Overloading in C++ Interview Questions & Answers - Learning Mode

C++ Overloading (Operator and Function) C++ allows you to specify more than one definition for a function name or an operator in the same scope, which is called function overloading and operator overloading respectively. Example of operator overloading in C++ Programming. In this program, a operator function void operator ++ () is defined(inside class temp ), which is invoked when ++ operator operates on the object of type temp.

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Operator Overloading in C++ Interview Questions & Answers - Learning Mode
Try Operator Overloading in C++ Interview Questions & Answers - Exam Mode
Question: What is virtual constructors/destructors?

Answer: Virtual destructors: If an object (with a non-virtual destructor) is destroyed explicitly by applying<br>the delete operator to a base-class pointer to the object, the base-class destructor function<br>(matching the pointer type) is called on the object.<br>There is a simple solution to this problem ? declare a virtual base-class destructor. This makes all<br>derived-class destructors virtual even though they don?t have the same name as the base-class<br>destructor. Source:
Question: What is the difference between "overloading" and "overriding"?

Answer: Overloading a method (or function) in C++ is the ability for functions of the same name to be defined as long as these methods have different signatures (different set of parameters). Method overriding is the ability of the inherited class rewriting the virtual method of the base class. Source:
Question: What is function overriding?

Answer: The function overloading is the technique in which you can make the function with more than one name but only if you will change the paramaters or the number of the paramaters. Source:
Question: Can main() be overridden?

Answer: In any application, there can be only one main function. In c++, main is not a member of any class. There is no chance of overriding Source:
Question: What is the difference between shadow and override?

Answer: Overriding is used to redefines only the methods, but shadowing redefines the entire element. Source:
Question: Can destructor be private?

Answer: Yes destructors can be private. But according to Standard Programming practise it is not advisable to have destructors to be private. Source:
Question: Can a method be overloaded based on different return type but same argument type ?

Answer: No, because the methods can be called without using their return type in which case there is ambiguity for the compiler. Source:
Question: What is difference between overloading and overriding?

Answer: a) In overloading, there is a relationship between methods available in the same class whereas in overriding, there is relationship between a superclass method and subclass method.<br><br>b) Overloading does not block inheritance from the superclass whereas overriding blocks inheritance from the superclass.<br><br>c) In overloading, separate methods share the same name whereas in overriding, subclass method replaces the superclass.<br><br>d) Overloading must h Source:
Question: What is the need /use of function overloading

Answer: Funtion over loading is yet another feature of polymorphism.Diff functions with the same function name but diff arguments are defined in a class.During compile time the appropriate function is called dep on the arguments passed.Eg:<br><br> class area<br><br>{<br><br>int sq,l,b;<br><br>float r;<br><br>public:<br><br>draw()<br><br>{cout<<"no shape"};<br><br>float draw(float );<br><br>i Source:
Question: What methods can be overridden in Java?

Answer: In C++ terminology, all public methods in Java are virtual. Therefore, all Java methods can be overwritten in subclasses except those that are declared final, static, and private. Source:
Question: You?re given a simple code for the class Bank Customer. Write the following functions:
* Copy constructor
* = operator overload
* == operator overload
* + operator overload (customers? balances should be added up, as an example of joint account between husband and wife)

Answer: Note:Anyone confusing assignment and equality operators should be dismissed from the interview. The applicant might make a mistake of passing by value, not by reference. The candidate might also want to return a pointer, not a new object, from the addition operator. Slightly hint that you?d like the value to be changed outside the function, too, in the first case. Ask him whether the statement customer3 = customer1 + customer2 would work in the second case. Source:
Question: In C++, what is the difference between method overloading and method overriding?

Answer: Overloading a method (or function) in C++ is the ability for functions of the same name to be defined as long as these methods have different signatures (different set of parameters). Method overriding is the ability of the inherited class rewriting the virtual method of the base class. Source:
Question: what is the operator overloading in c++

Answer: one operator with the different purpose.suppose + operator is used for concatenation as well as the addition.

Nicku Source:
Question: Say we have a class overridden in three steps, from class A to B to C.
If I do like this:

B* b = new C;
delete b;

Will this free the memory allocated by "new C"?

Answer: make the base class destructors as virtual Source:
Question: How many ways can an argument be passed to a subroutine?

Answer: An argument can be passed in two ways. They are Pass by Value and Passing by Reference.

Passing by value: This method copies the value of an argument into the formal parameter of the subroutine.

Passing by reference: In this method, a reference to an argument (not the value of the argument) is passed to the parameter. Source:
Question: What is operator overloading?what r the advantages of operator overloading?

Answer: Operator overloading:It is one of the features of Object oriented programming which gives an extra ability to an operator to act on a User-defined operand(Objects).<br><br>Uses of Operator Overloading:<br><br>Extensability: An operator will act differently depending on the operands provided.<br>Operator is not limited to work only with primitive Data Type.<br> Source:
Question: What is the difference between an interface and abstract class?

Answer: In the interface all methods must be abstract; in the abstract class some methods can be concrete. In the interface no accessibility modifiers are allowed, which is ok in abstract classes. Source:
Question: What is function overloading and operator overloading?

Answer: Function overloading: C++ enables several functions of the same name to be defined, as long as
these functions have different sets of parameters (at least as far as their types are concerned). This
capability is called function overloading. When an overloaded function is called, the C++ compiler
selects the proper function by examining the number, types and order of the arguments in the call.
Function overloading is commonly used to create several functions of the same name that perf Source:


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