Classes

1
Classes the full enchiladaChapter 20
2
Agenda

• Review ?
• Constructor functions
• Accessor functions
• Modifier functions
• input/output functions
• Summary

3
Review--Modeling a Balloon in C

• class Balloon
• public
• void initialize(int initRad)
• void inflate(int howMuch)
• void pop( )
• void display()
• private
• int radius

Member Functions
Member Data
4
Review--You can use the public functions defined
for the class

• Balloon bal
• bal.initialize(5)
• bal.inflate(15)
• bal.pop()

5
Review--Implement the initialize and inflate
functions

• void Ballooninitialize(int initRad)
• radius initRad
• void Ballooninflate(int howMuch)
• radius radius howMuch

This says it is a member function of Class
Balloon
Notice how the parameter modifiesthe member data
6
A client program is one that uses a class

• int main()
• Balloon myBalloon
• myBalloon.initialize(3)
• coutltlt"myBalloon currently has Radius "
• myBalloon.display()
• coutltlt"\nInflating myBalloon by 8 \n"
• myBalloon.inflate(8)
• coutltlt"Now myBalloon has Radius "
• myBalloon.display()
• coutltlt"\nPopping myBalloon \n"
• myBalloon.pop()
• coutltlt"myBalloon currently has Radius "
• myBalloon.display()

7
Agenda

• Review
• Constructor functions ?
• Accessor functions
• Modifier functions
• input/output functions
• Summary

8
Fully defined Balloon class in C

• class Balloon
• public
• // constructor functions
• Balloon( ) // default constructor
• Balloon(int initRad) // explicit constructor
• // accessor functions
• float volume( ) const // const means
  function cant
• // change radius
• int getRadius( ) const
• // modifier functions
• void inflate(int howMuch)
• void pop( )
• void setRadius(int r)
• continued

9
Fully defined Balloon class in C

• continued
• // input/output functions
• void display(ostream out)
• void input(istream in)
• private
• int radius
• // overloaded operators
• ostream operatorltlt( ostream out, Balloon b)
• istream operatorgtgt( istream in, Balloon b)
• bool operator( Balloon b1, Balloon b2)