C++ Misc

Question 1

Inline functions are useful when

• Function is large with many nested loops
• Function has many static variables
• Function is small and we want to avoid function call overhead.
• None of the above

Question 2

C

#include<iostream>
using namespace std;
int x = 1;
void fun()
{
    int x = 2;
    {
        int x = 3;
        cout << ::x << endl;
    }
}
int main()
{
    fun();
    return 0;
}

• 1
• 2
• 3
• 0

Question 3

How can we make a C++ class such that objects of it can only be created using new operator? If user tries to create an object directly, the program produces compiler error.

• Not possible
• By making destructor private
• By making constructor private
• By making both constructor and destructor private

Question 4

Would destructor be called, if yes, then due to which vector?

C

#include <iostream>
#include <vector>
using namespace std;

class a
{
public :
    ~a()
    {
        cout << \"destroy\";
    }
};
int main()
{
   vector <a*> *v1  = new vector<a*>;
   vector <a> *v2  = new vector<a>;
   return 0;
}

• v1
• v2
• v1 and v2
• no destructor call

Question 5

C

#include<iostream>
using namespace std;

int x[100];
int main()
{
    cout << x[99] << endl;
}

This question is contributed by Sudheendra Baliga

• Unpredictable
• Runtime error
• 0
• 99

Question 6

A member function can always access the data in __________ , (in C++).

• the class of which it is member
• the object of which it is a member
• the public part of its class
• the private part of its class

Question 7

Which of the following is not correct for virtual function in C++ ?

• Must be declared in public section of class.

• Virtual function can be static.

• Virtual function should be accessed using pointers.

• Virtual function is defined in base class.

Question 8

In C++, polymorphism requires:

• Inheritance only
• Virtual functions only
• References only
• Inheritance, Virtual functions and references

Question 9

Method over-riding can be prevented by using final as a modifier at ______.

• the start of the class.
• the start of method declaration.
• the start of derived class.
• the start of the method declaration in the derived class.

Question 10

In C, what is the effect of a negative number in a field width specifier?

• the values are displayed right justified
• the values are displayed centered
• the values are displayed left justified
• the values are displayed as negative numbers