Object-Oriented Programming and Class Design with Examples
Learn about object-oriented programming, class design, and object creation using classes and objects in various programming languages such as C++ and pseudocode. Dive into examples like creating a Circle class with methods to calculate area and exploring constructors in a BMW_Z4 class. Get insights into different programming concepts through practical examples.
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Presentation Transcript
Classes & Classes & Objects Objects OBJECT OBJECT- -ORIENTED ORIENTED PROGRAMMING AND PROGRAMMING AND CLASS DESIGN CLASS DESIGN
Class Circle Pseudocode CLASS Circle BEGIN CREATE Radius = 1.0 CONSTRUCTOR Circle //called default constructor BEGIN END CONSTRUCTOR CONSTRUCTOR Circle (NewRadius) //called constructor BEGIN Radius = NewRadius END CONSTRUCTOR METHOD getArea () //compute and return circle area BEGIN RETURN (Radius * Radius * 3.14159) END METHOD END CLASS Ps
Class Circle class Circle { public: double radius = 1.0; Circle(){ } Circle(double newRadius) //another constructor { radius = newRadius; } double getArea() //calculates area { return (radius*radius*3.14159); } }; //default constructor
Driver in Pseudocode CLASS TestCircle BEGIN CREATE circle1, circle2 AS Circle circle1 = NEW circle() circle2 = NEW circle(25.0) PRINT ("Circle 1 area = " + circle1.getArea()) PRINT ("Circle 2 area = " + circle2.getArea()) END TestCircle // create two variables // create circle1 object // create circle2 object Outputs: Circle 1 area = 3.14159 Circle 2 area = 1963.4937499999999 Ps
Driver in C++ int main () { Circle c1; cout<< "The area of the c1 is " << c1.getArea()<<endl; Circle c2(25); cout<<"The area of c2 is " << c2.getArea(); }
Example CLASS BMW_Z4 BEGIN CONSTRUCTOR BMW_Z4() // constructor #1 BEGIN ModelYear = 2004 TopUp = false LicensePlate = "DEALER" END CONSTRUCTOR CONSTRUCTOR BMW_Z4(parameter: year) // constructor #2 BEGIN ModelYear = year TopUp = false LicensePlate = "DEALER" END CONSTRUCTOR END CLASS Ps
C++ Constructor Example class BMW_Z4 { int modelYear; String licensePlate; boolean topUp; BMW_Z4 () { modelYear = 2004; topUp = false; licensePlate = "DEALER"; } BMW_Z4 (int year) { modelYear = year; topUp = false; licensePlate = "DEALER"; } }
Properties Example Pseudocode CLASS BMW_Z4 BEGIN PRIVATE ModelYear PRIVATE LicensePlate PUBLIC METHOD SetModelYear (Year) BEGIN ModelYear = Year END PUBLIC METHOD GetModelYear () BEGIN RETURN ModelYear END PUBLIC METHOD SetLicensePlate (value) BEGIN LicensePlate = value END PUBLIC METHOD GetLicensePlate () BEGIN RETURN LicensePlate END END CLASS Ps
Class BMW_Z4 class BMW_Z4 { public: int modelYear; string licensePlate; bool topUp; BMW_Z4(); BMW_Z4(int year); void SetModelYear(int Year); int getModelYear(); void SetLicensePlate(string value); string getLicensePlate(); void SetTopUp(bool value); bool getTopUp(); private: string LicensePlate; bool TopUp; };
BMW_Z4::BMW_Z4 (void) { modelYear = 2004; topUp = false; licensePlate = "DEALER"; } BMW_Z4::BMW_Z4 (int year) { modelYear = year; topUp = false; licensePlate = "DEALER"; } void BMW_Z4 :: SetModelYear(int Year) { modelYear = Year; } int BMW_Z4:: getModelYear() { return modelYear; } void BMW_Z4 :: SetLicensePlate(string value) {licensePlate = value;} string BMW_Z4 ::getLicensePlate(){ return licensePlate; } void BMW_Z4::SetTopUp(bool value) { TopUp = value; } bool BMW_Z4::getTopUp() { return TopUp; }
Creating Object and using functions: int main(){ BMW_Z4 s1(1995); s1.SetModelYear(678); s1.SetLicensePlate("string value"); cout << s1.getModelYear(); cout << s1.getLicensePlate(); }
