CPP Design of Class Hierarchies MCQ Objective Quiz

Subjects

एम एस सी आई टी

MSCIT

CPP

Design of Class Hierarchies has 9 Questions

Which interface determines how your class will be used by other program?

public

private

protected

None of the mentioned

Pick out the correct statement about override.

Overriding refers to a derived class function that has the same name and signature as a base class virtual function.

Overriding has different names.

both a & b

None of the mentioned

How many ways of reusing are there in class hierarchy?

How many types of class are there in c++?

Pick out the correct statement about multiple inheritance.

Deriving a class from one direct base class

Deriving a class from more than one direct base class

Deriving a class from more than one direct derived class

None of the mentioned

What is the output of this program?

```
    #include 
```
```
    using namespace std;
```
```
    class BaseClass 
```
```
    {
```
```
        int x;
```
```
        public:
```
```
        void setx(int n) 
```
```
        {
```
```
            x = n;
```
```
        }
```
```
        void showx() 
```
```
        {
```
```
            cout << x ;
```
```
        }
```
```
    };
```

    class DerivedClass : private BaseClass

```
    {
```
```
        int y;
```
```
        public:
```
```
        void setxy(int n, int m)
```
```
        {
```
```
            setx(n);      
```
```
            y = m;
```
```
        }
```
```
        void showxy() 
```
```
        {
```
```
            showx();       
```
```
            cout << y << '\n';
```
```
        }
```
```
    };
```
```
    int main()
```
```
    {
```
```
        DerivedClass ob;
```
```
        ob.setxy(10, 20);
```
```
        ob.showxy();
```
```
        return 0;
```
```
    }
```

1020

None of the mentioned

What does inheriatance allows you to do?

create a class

create a hierarchy of classes

access methods

None of the mentioned

What is the syntax of inheritance of class?

class name

class name : access specifer

class name : access specifer class name

None of the mentioned

What is the output of this program?

```
    #include 
```
```
    using namespace std;
```
```
    class BaseClass 
```
```
    {
```
```
        public:
```
```
        virtual void myFunction()
```
```
        {
```
```
            cout << "1";
```
```
        }
```
```
    };
```

    class DerivedClass1 : public BaseClass

```
    {
```
```
        public:
```
```
        void myFunction()
```
```
        {
```
```
            cout << "2";
```
```
        }
```
```
    };
```

   class DerivedClass2 : public DerivedClass1

```
    {
```
```
        public:
```
```
        void myFunction()
```
```
        {
```
```
            cout << "3";
```
```
        }
```
```
    };
```
```
    int main()
```
```
    {
```
```
        BaseClass *p;
```
```
        BaseClass ob;
```
```
        DerivedClass1 derivedObject1;
```
```
        DerivedClass2 derivedObject2;
```
```
        p = &ob;
```
```
        p -> myFunction();
```
```
        p = &derivedObject1;
```
```
        p -> myFunction();
```
```
        p = &derivedObject2;
```
```
        p -> myFunction();
```
```
        return 0;
```
```
    }
```

123

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