Question

I. Given the following code segment below what is the best description of line 5 and line 6? Identify the public and private members.

1. #include <iostream.h>

2. class SimpleCat

3. {

4. public:

5. SimpleCat (int age, int weight);

6. ~SimpleCat(){}

7. int GetAge() {return itsAge;}

8. int GetWeight() {return itsWeight;}

9. private:

10. int itsAge;

11. int itsWeight;

12. };

II. Multiple Choice questions

1. A function that is called automatically each time an object is created or

instantiated is

a. constructor b. Destructor c. Copy constructor

2. A constructor may be _____________.

a. provided by you b. overloaded c. both a and b

3. A class named Gymnast must have this destructor.

a. Gymnast b. Destructor c. ~Gymnast d. *destructor

4. The return type for all constructors is this.

a. void b. int c. float d. double e. no type is allowed

5. A class named Building has a method getfloors( ). If School is a child class of Building and AMA is an object of type School then which of the following are valid?

a)Building.getfloors(); b)School.getfloors( ) c)AMA.getfloors();

III. What is the output ?

class A

{

int a,b,c;

public:

A( )

{

cout<<"A"<<endl;

}

~A( )

{

cout<<"B"<<endl;

}

void add( )

{

a=2, b=3;

c=a+b;

cout<<c<<endl;

}

};

void main()

{

A ab;

ab.add( );

}

Answer 1

1.)

• Line 5 containes SimpleCat(int age, int weight). This is a parametrized constructor for the class SimpleCat
• Line 6 contains ~SimpleCat(). This is a destructor for the class SimpeCat
• Public members of the class are declared under the public: access specifier. They are
  • GetAge()
  • GetWeight()
• Private members are specified under private: access specifier. They are:
  • itsAge
  • itsWeight

2.)

• Constructors are called each time an objects is created. they are used to initalize values for data members
• Answer: Constructors

3.)

• A constructor may be provided by us, that is it can be defined by us.
• A constructor can be overloaded by providing different number of parameters to it.
• Answer: both a and b

4.)

• The desctructor of a class has the following syntax: ~<class-name>
• Answer: ~Gymnast

5.)

• A constuctor cannot return any value. It must have no return type under any case.
• Answer: no type is allowed

6.)

• If school inherits from Building, then every public methods of Building will be inhertied into School
• Also, these members cannot be accessed using classes, it must be accessed using Objects. Here AMA is an object
• Answer: AMA.getFloors()

7.)

• class A has a constructor that print 'A'. So, when the object ab is created, then this character will be printed along with a newline
• add() adds 2 and 3, and prints the result 5, along with a newline.
• When program terminates, the destructor of A is called. The destructor in class A prints "B", along with a newline
• Answer:

A

5

B