Question

Create a flowgorithm program to calculate the Area of Circle first then do the Circumference of...

Create a flowgorithm program to calculate the Area of Circle first then do the Circumference of Circle. The user will have the ability to convert Area OR the Circumference. That means we need to add a decision structure to the program. Furthermore, they need to be able to do it as many times as they want. That means we need to add a main loop structure to the program. The user will also have the choice of whether to run the program or not. Once they choose to run the conversion program they can do as many conversions as they want of either conversion.

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This time the user will have the ability convert Area of Circle or the Circumference of Circle but as many times as they want to. You will basically have 3 loops.

Requirements:

  • Add a loop to allow the user the ability to run the conversions over and over and over
    • This means there will be a main loop that uses the answer from MainMenu()
    • There will be a loop for each conversion. That means that once they choose either Area or Circumference, they do that conversion until they choose to exit. Choosing exit will take them back to the MainMenu() loop.
  • You will need to use modules that were required in Assignment 4 as well as the additions below
  • Don’t assume anything when it comes to what the user entered, which means an error message.
  • Be sure not to include the exit menu option in the error messages
  • Module addition:
    • ProgramHeader() - ProgramHeader(5), where 5 is the assignment number, can also be a variable holding the “5”
      • Output: Assignment 5 programmed by Hugh Schuett, where “Hugh Schuett” will be replaced by your name
      • Called at the beginning of the main()
    • ConversionMenu() - The menu for which conversion to do
      • Area and Exit or Circumference and Exit
      • Exit will exit and the main will then call the MainMenu() again
      • A parameter needs to be sent into the ConversionMenu() so it know which menu to display, the Area and Exit one or the Circumference and Exit one
    • MainMenu() - The menu to choose the loop
      • Run conversions which calls ConversionMenu() or Exit program
      • Has 3 options Area, Circumference or Exit.
      • Returns the users choice to the main()
    • OutputError() - Displays the error for invalid entries
      • Needs input so you can display the appropriate error message and options
      • Used everywhere you are checking input

Homework Answers

Answer #1

Java code :

import java.util.Scanner;
class CircleDemo
{
   static Scanner sc = new Scanner(System.in);
   public static void main(String args[])
   {
      System.out.print("Enter the radius: ");
      /*We are storing the entered radius in double
       * because a user can enter radius in decimals
       */
      double radius = sc.nextDouble();
      //Area = PI*radius*radius
      double area = Math.PI * (radius * radius);
      System.out.println("The area of circle is: " + area);
      //Circumference = 2*PI*radius
      double circumference= Math.PI * 2*radius;
      System.out.println( "The circumference of the circle is:"+circumference) ;
   }
}
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