C++ Function Overloading and Default Arguments

Question 1

Output?

CPP

#include<iostream>
using namespace std;

int fun(int x = 0, int y = 0, int z)
{  return (x + y + z); }

int main()
{
   cout << fun(10);
   return 0;
}

• 10
• 0
• 20
• Compiler Error

Question 2

What is the output of this C++ program?

#include 
using namespace std;
void square (int *x)
{
*x = (*x)++ * (*x);
}
void square (int *x, int *y)
{
*x = (*x) * --(*y);
}
int main ( )
{
int number = 30;
square(&number, &number);
cout << number;
return 0;
}

• 910
• 920
• 870
• 900

Question 3

Which of the following in Object Oriented Programming is supported by Function overloading and default arguments features of C++.

• Inheritance
• Polymorphism
• Encapsulation
• None of the above

Question 4

Which of the following overloaded functions are NOT allowed in C++? 1) Function declarations that differ only in the return type

    int fun(int x, int y);
         void fun(int x, int y); 

2) Functions that differ only by static keyword in return type

    int fun(int x, int y);
         static int fun(int x, int y); 

3)Parameter declarations that differ only in a pointer * versus an array []

int fun(int *ptr, int n);
int fun(int ptr[], int n); 

4) Two parameter declarations that differ only in their default arguments

int fun( int x, int y); 
int fun( int x, int y = 10); 

• All of the above
• All except 2)
• All except 1)
• All except 2 and 4

Question 5

Output of following program?

CPP

#include <iostream>
using namespace std;

int fun(int=0, int = 0);

int main()
{
  cout << fun(5);
  return 0;
}

int fun(int x, int y) { return (x+y); }

• Compiler Error
• 5
• 0
• 10

Question 6

Predict the output of following C++ program?

C

include<iostream>
using namespace std;
 
class Test
{
protected:
    int x;
public:
    Test (int i):x(i) { }
    void fun() const  { cout << \"fun() const \" << endl; }
    void fun()        {  cout << \"fun() \" << endl;     }
};
 
int main()
{
    Test t1 (10);
    const Test t2 (20);
    t1.fun();
    t2.fun();
    return 0;
}

• Compiler Error
• fun()
  fun() const
  
• fun() const
  fun() const
  
• fun()
  fun()