Primitive data members.

To write a C++ program to display area of circle and rectangle using classes with primitive data members.

Algorithm:

Step 1: Start the program.

Step 2: Create a class area and declare the variables.

Step 3: Call the appropriate functions using object in the main function.

Step 4: Stop the program.

Program Code:

#include<iostream.h>

#include<conio.h>

#define pi 3.14

class area

{

int area1,area2;

public:

void circle(int r);

void rectangle(int l,int b);

};

void area::circle(int r)

{

area1=pi*r*r;

cout<<"Area of the Circle:"<<area1;

}

void area::rectangle(int l,int b)

{

area2=l*b;

cout<<"Area of the Rectangle:"<<area2;

}

void main()

{

int r,l,b;

clrscr();

area a;

cout<<"\nEnter the radius of the circle:";

cin>>r;

a.circle(r);

cout<<"\n\nEnter the length and breadth of the rectangle:";

cin>>l>>b;

a.rectangle(l,b);

getch();

}

Output:

Enter the radius of the circle:12

Area of the circle:452

Enter the length and breadth of the rectangle:12 6

Area of the rectangle:72