Write a class to represent an object with different states such as a switch (on/off), light bulb (on/off or (off/green/red)) or emoticon (happy/sad). Screen location should be a property of the object. Provide a function draw(Graphics g) to draw the object on the screen. Write a main program to instantiate and display several objects, each with a different state. Solution This program is used to represent a class for a bulb. Three objects are used to represent different states(off/red/green) of the bulb. #include<iostream.h> #include<graphics.h> enum bstate {off=15,green=2,red=4}; //class for a light bulb class bulb { int state; int x,y; public: bulb(int,int,int); void draw(); }; //Constructor to initialize bulb object bulb::bulb(int a,int b,int s) { state=s; x=a; y=b; } //function to draw the bulb in their respective screen coordinates and color void bulb::draw() { setcolor(state); setfillstyle(SOLID_FILL,state); fillellipse(x,y,15,15); } int main() { int gdriver = DETECT, gmode; initgraph(&gdriver, &gmode, \"..\\\\bgi\"); bulb offbulb(50,50,off); //initialize off bulb bulb greenbulb(50,150,green);   //initialize green bulb bulb redbulb(50,250,red); //initialize red bulb offbulb.draw();   //draw off bulb greenbulb.draw(); //draw green bulb redbulb.draw(); //draw red bulb return 0; } .

1. Write a class to represent an object with different states such as a switch (on/off), light bulb
(on/off or (off/green/red)) or emoticon (happy/sad). Screen location should be a property of the
object. Provide a function draw(Graphics g) to draw the object on the screen. Write a main
program to instantiate and display several objects, each with a different state.
Solution
This program is used to represent a class for a bulb. Three objects are used to represent different
states(off/red/green) of the bulb.
#include<iostream.h>
#include<graphics.h>
enum bstate {off=15,green=2,red=4};
//class for a light bulb
class bulb
{
int state;
int x,y;
public:
bulb(int,int,int);
void draw();
};
//Constructor to initialize bulb object
bulb::bulb(int a,int b,int s)
{
state=s;
x=a;
y=b;
}
//function to draw the bulb in their respective screen coordinates and color

2. void bulb::draw()
{
setcolor(state);
setfillstyle(SOLID_FILL,state);
fillellipse(x,y,15,15);
}
int main()
{
int gdriver = DETECT, gmode;
initgraph(&gdriver, &gmode, "..bgi");
bulb offbulb(50,50,off); //initialize off bulb
bulb greenbulb(50,150,green); Â Â //initialize green bulb
bulb redbulb(50,250,red); //initialize red bulb
offbulb.draw(); Â Â //draw off bulb
greenbulb.draw(); //draw green bulb
redbulb.draw(); //draw red bulb
return 0;
}