Operator Overloading

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Question 1

How can we restrict dynamic allocation of objects of a class using new?

A
By overloading new operator
B
By making an empty private new operator.
C
By making an empty private new and new[] operators
D
By overloading new operator and new[] operators

Question 2

Which of the following operators are overloaded by default by the compiler in every user defined classes even if user has not written?

1) Comparison Operator ( == )
2) Assignment Operator ( = )

A
Both 1 and 2
B
Only 1
C
Only 2
D
None of the two

Question 3

Which of the following operators should be preferred to overload as a global function rather than a member method?

A
Postfix ++
B
Comparison Operator
C
Insertion Operator <<
D
Prefix++

Question 4

Which of the following is an example of compile-time polymorphism?

A
Function Overloading
B
Virtual function
C
Function Overriding
D
Dynamic Casting

Question 5

CPP

#include<iostream>
using namespace std;

class Point {
private:
  int x, y;
public:
  Point() : x(0), y(0) { }
  Point& operator()(int dx, int dy);
  void show() {cout << "x = " << x << ", y = " << y; }
};

Point& Point::operator()(int dx, int dy)
{
    x = dx;
    y = dy;
    return *this;
}

int main()
{
  Point pt;
  pt(3, 2);
  pt.show();
  return 0;
}

A
x = 3, y = 2
B
Compiler Error
C
x = 2, y = 3

Question 6

Output of following program?

#include <iostream>
using namespace std;
class Test2
{
    int y;
};

class Test
{
    int x;
    Test2 t2;
public:
    operator Test2 ()  { return t2; }
    operator int () { return x; }
};

void fun ( int x) { cout << "fun(int) called"; }
void fun ( Test2 t ) { cout << "fun(Test 2) called"; }

int main()
{
    Test t;
    fun(t);
    return 0;
}

A
fun(int) called
B
fun(Test 2) called
C
Compiler Error: Ambiguous call to fun()

Question 7

Which of the following operators cannot be overloaded?

A
. (Member Access or Dot operator)
B
?: (Ternary or Conditional Operator )
C
:: (Scope Resolution Operator)
D
.* (Pointer-to-member Operator )
E
All of the above

Question 8

Which of the following statements are true regarding C++?

(a) Overloading gives the capability to an existing operator to operate on other data types.

(b) Inheritance in object oriented programming provides support to reusability.

(c) When object of a derived class is defined, first the constructor of derived class is executed then constructor of a base class is executed.

(d) Overloading is a type of polymorphism.

Choose the correct option from those given below:

A
(a) and (b) only
B
(a), (b) and (c) only
C
(a), (b) and (d) only
D
(b), (c) and (d) only

Question 9

What is Operator overloading?

Tags:

C++

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