Computer Applications
Write a program using a method called area() to compute area of the following:
(a) Area of circle = (22/7) * r * r
(b) Area of square= side * side
(c) Area of rectangle = length * breadth
Display the menu to display the area as per the user's choice.
Answer
import java.util.Scanner;
public class KboatMenuArea
{
public void area() {
Scanner in = new Scanner(System.in);
System.out.println("Enter a to calculate area of circle");
System.out.println("Enter b to calculate area of square");
System.out.println("Enter c to calculate area of rectangle");
System.out.print("Enter your choice: ");
char choice = in.next().charAt(0);
switch(choice) {
case 'a':
System.out.print("Enter radius of circle: ");
double r = in.nextDouble();
double ca = (22 / 7.0) * r * r;
System.out.println("Area of circle = " + ca);
break;
case 'b':
System.out.print("Enter side of square: ");
double side = in.nextDouble();
double sa = side * side;
System.out.println("Area of square = " + sa);
break;
case 'c':
System.out.print("Enter length of rectangle: ");
double l = in.nextDouble();
System.out.print("Enter breadth of rectangle: ");
double b = in.nextDouble();
double ra = l * b;
System.out.println("Area of rectangle = " + ra);
break;
default:
System.out.println("Wrong choice!");
}
}
}
Variable Description Table
Program Explanation
Output
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