Questions and answers for exam Preparation

MCQs

Total Questions : 10

Question 1.

What are the things are inherited from the base class?

Constructor and its destructor
Operator=() members
Friends
All of the mentioned

Discuss Question

Answer: Option D. -> All of the mentioned

These things can provide necessary information for the base class to make a logical decision.

Question 2.

Which design patterns benefit from the multiple inheritance?

Adapter and observer pattern
Code pattern
Glue pattern
None of the mentioned

Discuss Question

Answer: Option A. -> Adapter and observer pattern

None.

Question 3.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
class Base1
4.
{
5.
protected:
6.
int SampleDataOne;
7.
public:
8.
Base1()
9.
{
10.
SampleDataOne = 100;
11.
}
12.
~Base1()
13.
{
14.
}
15.
int SampleFunctOne()
16.
{
17.
return SampleDataOne;
18.
}
19.
};
20.
class Base2
21.
{
22.
protected:
23.
int SampleDataTwo;
24.
public:
25.
Base2()
26.
{
27.
SampleDataTwo = 200;
28.
}
29.
~Base2()
30.
{
31.
}
32.
int SampleFunctTwo()
33.
{
34.
return SampleDataTwo;
35.
}
36.
};
37.
class Derived1 : public Base1, public Base2
38.
{
39.
int MyData;
40.
public:
41.
Derived1()
42.
{
43.
MyData = 300;
44.
}
45.
~Derived1()
46.
{
47.
}
48.
int MyFunct()
49.
{
50.
return (MyData + SampleDataOne + SampleDataTwo);
51.
}
52.
};
53.
int main()
54.
{
55.
Base1 SampleObjOne;
56.
Base2 SampleObjTwo;
57.
Derived1 SampleObjThree;
58.
cout

100
200
Both a & b
None of the mentioned

Discuss Question

Answer: Option C. -> Both a & b

In this program, We are passing the values by using multiple inheritance and printing the derived values.
Output:
$ g++ mul4.cpp
$ a.out
100
200

Question 4.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
struct a
4.
{
5.
int count;
6.
};
7.
struct b
8.
{
9.
int* value;
10.
};
11.
struct c : public a, public b
12.
{
13.
};
14.
int main()
15.
{
16.
c* p = new c;
17.
p->value = 0;
18.
cout

Inherited
Error
Runtime error
None of the mentioned

Discuss Question

Answer: Option A. -> Inherited

In this program, We apply the multiple inheritance to structure.
Output:
$ g++ mul2.cpp
$ a.out
Inherited

Question 5.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
class student
4.
{
5.
public:
6.
int rno , m1 , m2 ;
7.
void get()
8.
{
9.
rno = 15, m1 = 10, m2 = 10;
10.
}
11.
};
12.
class sports
13.
{
14.
public:
15.
int sm;
16.
void getsm()
17.
{
18.
sm = 10;
19.
}
20.
};
21.
class statement:public student,public sports
22.
{
23.
int tot,avg;
24.
public:
25.
void display()
26.
{
27.
tot = (m1 + m2 + sm);
28.
avg = tot / 3;
29.
cout

3100
3010
2010
1010

Discuss Question

Answer: Option B. -> 3010

In this program, We are calculating the total and average marks of a student by using multiple inheritance.
Output:
$ g++ mul1.cpp
$ a.out
3010

Question 6.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
class Base
4.
{
5.
public:
6.
virtual void print() const = 0;
7.
};
8.
class DerivedOne : public Base
9.
{
10.
public:
11.
void print() const
12.
{
13.
cout

DerivedOne
DerivedTwo
Error
None of the mentioned

Discuss Question

Answer: Option C. -> Error

In this program, 'Base' is an ambiguous base of 'Multiple'. So it is producing an error. And this

program is a virtual base class.

Question 7.

Which of the following advantages we lose by using multiple inheritance?

Dynamic binding
Polymorphism
Both a & b
None of the mentioned

Discuss Question

Answer: Option C. -> Both a & b

The benefit of dynamic binding and polymorphism is that they help making the code easier to

extend but by multiple inheritance it makes harder to track.

Question 8.

Which symbol is used to create multiple inheritance?

Dot
Comma
Dollar
None of the mentioned

Discuss Question

Answer: Option B. -> Comma

For using multiple inheritance, simply specify each base class (just like in single inheritance),

separated by a comma.

Question 9.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
class polygon
4.
{
5.
protected:
6.
int width, height;
7.
public:
8.
void set_values (int a, int b)
9.
{
10.
width = a; height = b;}
11.
};
12.
class output1
13.
{
14.
public:
15.
void output (int i);
16.
};
17.
void output1::output (int i)
18.
{
19.
cout