To calculate the area of circle, rectangle and triangle using function overloading. July 8, 2011

ALGORITHM:
STEP 1: Start the program.
STEP 2: Declare the class name as fn with data members and member functions.
STEP 3: Read the choice from the user.
STEP 4: Choice=1 then go to the step 5.
STEP 5: The function area() to find area of circle with one integer argument.
STEP 6: Choice=2 then go to the step 7.
STEP 7: The function area() to find area of rectangle with two integer argument.
STEP 8: Choice=3 then go to the step 9.
STEP 9: The function area() to find area of triangle with three arguments, two as Integer and one as float.
STEP 10: Choice=4 then stop the program.

PROGRAM:

01	#include<iostream.h>

02	#include<stdlib.h>

03	#include<conio.h>

04	#define pi 3.14

05

class fn

06

{

07

public:

08	void area(int); //circle

09	void area(int,int); //rectangle

10	void area(float ,int,int);  //triangle

11

};

12

13	void fn::area(int a)

14

{

15	cout<<"Area of Circle:"<<pi*a*a;

16

}

17	void fn::area(int a,int b)

18

{

19	cout<<"Area of rectangle:"<<a*b;

20

}

21	void fn::area(float t,int a,int b)

22

{

23	cout<<"Area of triangle:"<<t*a*b;

24

}

25

26	void main()

27

{

28

int ch;

29	int a,b,r;

30

clrscr();

31

fn obj;

32	cout<<"\n\t\tFunction Overloading";

33	cout<<"\n1.Area of Circle\n2.Area of Rectangle\n3.Area of Triangle\n4.Exit\n:”;

34	cout<<”Enter your Choice:";

35

cin>>ch;

36

37	switch(ch)

38

{

39

case 1:

40	cout<<"Enter Radious of the Circle:";

41

cin>>r;

42	obj.area(r);

43

break;

44

case 2:

45	cout<<"Enter Sides of the Rectangle:";

46	cin>>a>>b;

47	obj.area(a,b);

48

break;

49

case 3:

50	cout<<"Enter Sides of the Triangle:";

51	cin>>a>>b;

52	obj.area(0.5,a,b);

53

break;

54

case 4:

55

exit(0);

56

}

57

getch();

58

}

Output:
Function Overloading
1. Area of Circle
2. Area of Rectangle
3. Area of Triangle
4. Exit
Enter Your Choice: 2
Enter the Sides of the Rectangle: 5 5
Area of Rectangle is: 25
1. Area of Circle
2. Area of Rectangle
3. Area of Triangle
4. Exit
Enter Your Choice: 4