Object Oriented Programming. Solved MCQs - Part 2

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1 Object Oriented Programming Solved MCQs - Part 2

2 Object Oriented Programming Solved MCQs - Part 2 It is possible to declare as a friend A member function A global function A class All of the above What will be the result of the expression 13 & 25? A function call mechanism that passes arguments to a function by passing a copy of the values of the arguments is Call by name Call by value Call by reference Call by value result The members of a class, by default, are Public Protected Private Mandatory to specify

3 Which of the following is a string literal constant? Visual C A All of the above Which of the following statements is NOT valid about operator overloading? Only existing operators can be overloaded Overloaded operator must have at least one operand of its class type The overloaded operators follow the syntax rules of the original operator None of the above What is the output of the following code char symbol[3]={ a, b, c }; for (int index=0; index<3; index++) cout << symbol [index]; a b c abc abc abc Which of the statements is true in a protected derivation of a derived class from a base class? Private members of the base class become protected members of the derived class Protected members of the base class become public members of the derived class Public members of the base class become protected members of the derived class Protected derivation does not affect private and protected members of the derived class

4 In which case is it mandatory to provide a destructor in a class? Almost in every class Class for which two or more than two objects will be created Class for which copy constructor is defined Class whose objects will be created dynamically The concept of hierarchical classification is related to Abstraction Inheritance Function overloading None Assume that we have constructor function for both Base and Derived classes. Now consider the declaration : main ( ) Base *p = new Derived; In what sequence, the constructor will be executed? Derived class constructor is followed by Base class constructor. Base class constructor is followed by Derived class constructor. Base class constructor is never called. Derived class constructor is never called. If you wanted to sort many large objects or structures, it would be most efficient to Place them in an array and sort the array. Place pointers to them in an array and sort the array. Place them in a linked list and sort the linked list. Place references to them in an array and sort the array.

5 cfront is the front end of a C compiler is the per-process of a C compiler is a tool that is translated a C++ code to its equivalent C code None of above Usually a pure virtual function Has complete function body Will never be called Will be called only to delete an object Is defined only in derived class A static data member is given a value Within the class definition Outside the class definition When the program is exeuted Never C++ was originally developed by Clocksin and Melish Donald E.Knuth Sir Richard Hadlee Bjarne Stroustrup What is the error in the following code? class t { virtual void print(); } No error

6 Function print() should be declared as static. Function print() should be defined. Class t should contain data members. If a class C is derived from class B, which is derived from class A, all through public inheritance, then a class C member function can access Protected and public data only in C and B Protected and public data only in C Private data in A and B Protected data in A and B A friend function has access to all private and protected members of the class for which it is a friend Only private Private and protected Only protected None of the above Which of the following cannot be legitimately passed to a function A constant A variable A structure A header file Match the following : (a) Garbage collection in 1. Java (b) Nameless object 2. generic programming (c) Template support 3. defines a class (d) A forward reference 4. member function (e) Derived class inherits from base class

7 The polymorphism can be characterized by the phrase One interface,multiple methods Multiple interfaces,one method One interface,one method None of the above A class defined within another class is Nested class Inheritance Containership Encapsulation In multiple inheritance The base classes must have only default constructors Cannot have virtual functions Cannot have virtual classes None of the above Which of the statements are true? I. Function overloading is done at compile time. II. Protected members are accessible to the member of derived class. III. A derived class inherits constructors and destructors. IV. A friend function can be called like a normal function. V. Nested class is a derived class. I, II, III II, III, V

8 III, IV, V I, II, IV In C++, dynamic memory allocation is accomplished with the operator new this malloc( ) delete Use of virtual functions implies Overloading Overriding Static binding Dynamic binding Which of the following type casts will convert an Integer variable named amount to a Double type? (double) amount (int to double) amount int to double(amount) int (amount) to double The members of a class by default are Public Protected Private Mandatory to specify What will be the output of following program?

9 #include<iostream.h> void main() { float x; x=(float)9/2; cout<<x; } Which feature in OOP allows reusing code? Polymorphism Inheritance Encapsulation Data hiding Exception handling is targeted at Run-time error Compile time error Logical error All of the above Overloading a postfix increment operator by means of a member function takes No argument One argument Two arguments Three arguments

10 Which of the following, if any, are valid names for variables? class friend void None of the above is valid names for variables What does C++ append to the end of a string literal constant? a space a number sign (#) an asterisk (*) a null character A template class Is designed to be stored in different containers Works with different data types Generates objects which must be identical Generates classes with different numbers of member functions A struct is the same as a class except that There are no member functions All members are public Cannot be used in inheritance hierarchy It does have a this pointer An array element is accessed using a first-in-first-out approach the dot operator a member name an index number

11 Which of the following is not the characteristic of constructor? They should be declared in the public section. They do not have return type. They can not be inherited. They can be virtual. An exception is caused by A hardware problem A problem in the operating system A syntax error A run-time error To access the public function fbase() in the base class, a statement in a derived class function fder() uses the statement.fbase(); fbase(); fder(); base::fbase(); der::fder(); RunTime Polymorphism is achieved by Friend function Virtual function Operator overloading Function overloading Runtime polymorphism is achieved by Friend function Virtual function

12 Operator overloading Function overloading Pure virtual functions Have to be redefined in the inherited class Cannot have public access specification Are mandatory for a virtual class None of the above If x =5, y =2 then x ^y equals. (where ^ is a bitwise XOR operator) Identify the operator that is NOT used with pointers -> & * >> A friend function to a class, C cannot access Private data members and member functions Public data members and member functions Protected data members and member functions The data members of the derived class of C A variable defined within a block is visible

13 From the point of definition onward in the program From the point of definition onward in the function From the point of definition onward in the block Throughout the function The function whose prototype is void getdata(item *thing); receives a pointer to a structure a reference to a structure a copy of a structure nothing The keyword friend does not appear in The class allowing access to another class The class desiring access to another class The private section of a class The public section of a class

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