1. Pick out the correct option.
A. We cannot make an instance of an abstract base class
B. We can make an instance of an abstract base class
C. Both a & b
D. None of the mentioned
Answer: A. We cannot make an instance of an abstract base class
2. Where does the abstract class is used?
A. base class only
B. derived class
C. both a & b
D. None of the mentioned
Answer: A. base class only
3. What is the output of this program?
#include <iostream>
using namespace std;
class MyInterface
{
public:
virtual void Display() = 0;
};
class Class1 : public MyInterface
{
public:
void Display()
{
int a = 5;
cout << a;
}
};
class Class2 : public MyInterface
{
public:
void Display() { cout << ” 5″ << endl; }
};
int main()
{
Class1 obj1;
obj1.Display();
Class2 obj2;
obj2.Display();
return 0;
}
A. 5
B. 10
C. 5 5
D. None of the mentioned
4. What does the class definitions in following code represent?
class Bike {
Engine objEng;
};
class Engine {
float CC;
};
A. kind of relationship
B. has a relationship
C. Inheritance
D. Both A and B
Answer: B. has a relationship
5. Which of the following statement is correct about the program given below?
#include<iostream.h>
class Chd {
static int x; // Static member variable
public:
static void SetData(int xx) { // Static member function
x = xx;
}
static void Display() { // Static member function
cout << x;
}
};
// Definition of the static member outside the class
int Chd::x = 0;
int main() {
Chd::SetData(44); // Calling static function SetData to set x = 44
Chd::Display(); // Calling static function Display to print x
return 0;
}
A. The program will print the output 0.
B. The program will print the output 44.
C. The program will print the output Garbage.
D. The program will report compile time error.
Answer: B. The program will print the output 44
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