MIDTERM PROJECT
I – PROGRAM WRITERS * Melecio L. Bernido Jr. * Victor T. Singcol
II – PROBLEM:
11. Write a Java Application that calculates and prints the diameter, the circumference, or the area of the circle, given the radius. The application should input a character corresponding to one of these actions: D for diameter, C for Circumference and A for area. The user should be prompted to enter the radius in floating point form and then the appropriate letter. The output should be labeled appropriately. For example, 6.75 and A, your program should print like this:

The area of the Circle with radius 6.75 is 143.14.

Here some formulas you need:

Diameter=2r
Circumference=2∏r
Area of the circle=∏r2
III – OBJECTIVE * To create a program that will compute the area of the circle.

IV – ALGORITHM
Begin

Declare variables pie, diameter, circumference, radius , area

Prompt the user

Pie = 3.1416

Choice ==’D’
Choice==’d’

Display the Diameter with radius 6.75
Diameter = (radius)*2

Choice==’C’
Choice==’c’

Display the Circumference with the radius 6.75
Circumference = 2*(pie)*(radius)

Display the area with radius 6.75
Choice==’A’
Choice==’a’

Area = ∏ r2

Default:
Invalid

End

V – SOURCE CODE import java.util.Scanner; public class Calculation{ public static void main(String[]args){ Scanner in=new Scanner(System.in); double pie,diameter,circumference,radius,Area; String t; char choice; System.out.println("Enter D for diameter"); System.out.println("Enter C for circumference"); System.out.println("Enter A for Area"); t=in.nextLine(); choice= t.charAt(0); pie=3.1416; radius= 6.75; switch (choice){ case 'D': case 'd': diameter=radius*2; System.out.println("The diameter of the circle with radius 6.75 is " + diameter); break; case 'C': case 'c': circumference=2*pie*radius; System.out.println("The circumference of the circle with radius 6.75 is " + circumference); break; case 'A': case 'a': Area=pie*radius*radius; System.out.println("The area of the circle with radius 6.75 is " + Area); break; default: System.out.println("invalid"); break; } }
}

VI – OUTPUT