This document contains 9 exercises demonstrating object-oriented programming concepts in C++ like classes, methods, constructors, and destructors. The exercises create classes to represent geometric shapes, birds, boxes, and more. Methods are defined to set and get data, calculate areas, and display output. Constructors and destructors are used to initialize and cleanup object memory.

1. OBJECT ORIENTED PROGRAMMING
EXERCISE 9 CODING
MUHAMAD ZULHAIRI BIN AB SATAR
D20101038665

2. EXERCISE 1
#include<iostream.h>
class Rectangle
{
public:
int length;
int width;
public:
void set_data(int x, int y);
double calculate_area();
void display();
};
void Rectangle::set_data(int x, int y)
{
length=x;
width=y;
}
double Rectangle::calculate_area()
{
return length*width;
}
void main()
{

3. // object declaration
Rectangle r1,r2;
//calling method set_data()
r1.set_data(10,20); //length and width for the first rectangle
int a,b;
cout<<" Enter The Second Rectangle "<<endl;
cout<<" a : ";
cin>>a;
cout<<" b : ";
cin>>b;
// calling method
r2.set_data(a,b);
// not valid because it is private attribute
r2.length=a;
cout<<" nn ";
cout<<" HERE ARE THE AREA FOR THE FIRST AND THE SECOND RECTANGLE "<<endl;
cout<<" -----------------------------------------------------------"<<endl;
cout<<"Area for first rectangle is: "<<r1.calculate_area()<<" nArea for second rectangle is:
"<<r2.calculate_area()<<endl;
}

5. EXERCISE 2
#include<iostream.h>
class coordinate
{
private:
int x,y;
public:
void setX(int theX);
void findY();
void printXY(void);
};
void coordinate::printXY(void)
{
cout<<"The coordinate is ("<<x<<","<<y<<")";
}
void coordinate::findY()
{
y=(2*x)+1;
}

6. void coordinate::setX(int theX)
{
x=theX;
}
void main(void)
{
coordinate point;
// first coordinate of (x,y)
int userX;
cout<<"LINEAR GRAPH: y=2x+1"<<endl;
cout<<"Enter the X point?";
cin>>userX;
//set and display coordinate (x,y)
point.setX(userX);
point.findY();
point.printXY();
cout<<endl<<endl<<"End of program.";
}

8. EXERCISE 3
#include<iostream.h>
class bird{
private :
char *color;
char *name;
public :
bird();
void display();
};
bird::bird(){
color="black";
name="jackjaw";
}
void bird::display(){
cout<<"The bird color is"<<color<<endl;
cout<<"The bird name is"<<name<<endl;
}
void main(){
bird bird1;
bird1.display();
}

10. EXERCISE 4
#include<iostream.h>
class bird{
private :
char *color;
char *name;
public :
bird(char *c, char *n);
void display();
};
bird::bird(char *a, char *n){
color=a;
name=n;
}
void bird::display(){
cout<<"The bird color is : "<<color<<endl;
cout<<"The bird name is : "<<name<<endl;
}
void main()
{
bird bird1("pink","Peacock");
bird1.display();
}

12. EXERCISE 5
#include<iostream>
class bird{
private :
char *color;
char *name;
public :
bird();
bird(char *c, char *n);
void display();
};
bird::bird()
{
color="Purple";
name="Peacock";
}
bird::bird(char *a, char *n){
color=a;
name=n;
}
void bird::display()
{
cout<<"The bird color is : "<<color<<endl;

13. cout<<"The bird name is : "<<name<<endl;
}
void main()
{
bird bird1;
bird bird2("peach","peguin");
bird1.display();
bird2.display();
}

14. EXERCISE 6
#include<iostream>
class bird
{
private :
int num_legs;
int num_wings;
public :
bird(int l, int w);
bird(bird &num);
void display();
};
bird::bird(int le, int wi)
{
num_legs=le;
num_wings=wi;
}
bird::bird(bird &br)
{
num_legs=br.num_legs;
num_wings=br.num_wings;
}
void bird::display(void)

15. {
cout<<"The number of legs are :"<<num_legs<<endl;
cout<<"The number of wings are :"<<num_wings<<endl;
}
void main()
{
bird bird1(2, 2); //object bird1 is created and initialized
bird bird2(bird1);//object bird 2 is created and the values of object bird1 are copied into object
bird 2
bird1.display();
bird2.display();
}

16. EXERCISE 7
#include<iostream>
using namespace std;
class student{
char *hair_color;
char *skin_color;
public:
student();
student(char*hc,char*sc);
student(student &std);
void display();
};
student::student()
{
}
student::student(char*hcl, char*sck)
{
hair_color=hcl;
skin_color=sck;
}
student::student(student &h){
hair_color=h.hair_color;

17. skin_color=h.skin_color;
}
void student::display(void){
cout<<"The hair color is"<<hair_color<<endl;
cout<<"The skin color is"<<skin_color<<endl;
}
void main(){
student student0();
student student1("Brown","White");
student student2(student1);
student1.display();
student2.display();
}

18. EXERCISE 8
#include<iostream>
class BOX
{
int length;
int width;
public:
BOX();
~BOX();
};
BOX::BOX()
{
cout<<"Welcome To Constructor Box" <<endl;
}
BOX::~BOX()
{
cout<<"Welcome To Destructor Box"<<endl;
}
void main()
{

19. BOX BOX1;
}

20. EXERCISE 9
#include<iostream.h>
class SegiEmpat
{ private:
int i;
public:
void display (); // method declaration
SegiEmpat ();// constructor declaration
~SegiEmpat (); // destructor declaration
};
void SegiEmpat::display()
{
cout<<"nIn function display";
}
SegiEmpat::SegiEmpat()
{
cout<<"nIn constructor";
}
SegiEmpat::~SegiEmpat()
{
cout<<"nIn destructor"<<endl;
}
int main()
{ SegiEmpat obj1;

21. obj1.display();
return 0;
}