Question

Ch 4 Program 3  – Geometry Calculator

Please adhere to the Standards for Programming Assignments and the Java Coding Guideline.

:

• List of source code with comments to document
• Test output listed as comments at the end of your program

GeometryCalculator.java (15 pts)

Write a program that displays the following menu:

1. Calculate the area of a circle
2. Calculate the area of a rectangle
3. Calculate the area of a triangle
4. Calculate the volume of a cylinder
5. Quit

Prompt the user to enter a menu choice.

Then based on the user’s choice use a switch statement to do the following:

• If the user enters 1, then you should prompt for the radius of the circle and display its area. Use MATH.PI for the value of PI.
• If the user enters 2, then prompt for the length and width of the rectangle, and then display the rectangle’s area.
• If the user enters 3, then prompt for the base and height of the triangle, and then display its area.
• If the user enters 4, then prompt for the radius and height of the cylinder, and then display its volume.
• If the user enters 5, the program should end.
• Note that the program also ends after displaying the area or the volume of figures.

submit GeometryCalculator.java on Canvas.

Input validation:

• Display an error message if the user enters a menu number outside the range of 1 through 4 and ends the program.
• Only accept positive values for the circle’s radius, the rectangle’s length or width, or the triangle’s base or height. In such a case, display an error message and end the program.

                  Hint:

                  Do not try to write the entire program in one go. It is much easier to write a small piece and test it, then write another small piece and test it. For example, start by writing just a skeleton with input and output. Then add the code to do the normal computation, without any data validation. Then add each additional data validation rule, one at a time. You should test your program with simple test inputs to check that you handle each case. Good luck!

Test data: Your included output must show your program running with the following sequence.

Test Menu choice 1.  Radius = 3.7 then

Menu choice 2.  length = 5.5, width = 3.

Menu choice 4.  Radius = 3.5, height = 8.

Menu choice 9.  Should generate an error message.

Menu choice 3.  base = -6.2, height = 4.Should generate an error message  

Menu choice 5.  Quit the program.

Example output:

***Geometry Calculator***

1.    Calculate the area of a Circle

2.    Calculate the area of a Rectangle

3.    Calculate the area of a Triangle

4.    Calculate the volume of a cylinder

5.    Quit

Enter your choice (1-5): 1

Enter the circle's radius: 3.7

The area is 43.0084

Thanks for using the Geometry Calculator!

***Geometry Calculator***

1.    Calculate the area of a Circle

2.    Calculate the area of a Rectangle

3.    Calculate the area of a Triangle

4.    Calculate the volume of a cylinder

5.    Quit

Enter your choice (1-5): 2

Enter the rectangle's length: 5.5

Enter the rectangle's width: 3

The area is 16.5

Thanks for using the Geometry Calculator!

---------------------------------------------------------------------

***Geometry Calculator***

1.    Calculate the area of a Circle

2.    Calculate the area of a Rectangle

3.    Calculate the area of a Triangle

4.    Calculate the volume of a cylinder

5.    Quit

Enter your choice (1-5): 4  

Enter the cylinder's radius: 3.5

Enter the cylinder’s height: 8

The volume is 307.8760

Thanks for using the Geometry Calculator!

------------------------------------------------------------------------

***Geometry Calculator***

1.    Calculate the area of a Circle

2.    Calculate the area of a Rectangle

3.    Calculate the area of a Triangle

4.    Calculate the volume of a cylinder

5.    Quit

Enter your choice (1-5): 9

You may only enter 1, 2, 3, 4 or 5.

Thanks for using the Geometry Calculator!

-------------------------------------------------------------------------

***Geometry Calculator***

1.    Calculate the area of a Circle

2.    Calculate the area of a Rectangle

3.    Calculate the area of a Triangle

4.    Calculate the volume of a cylinder

5.    Quit

Enter your choice (1-5): 3

Enter the length of the base: -6.2

Enter the triangle's height: 4

Only positive values are accepted for the base.

Thanks for using the Geometry Calculator!

-------------------------------------------------------------------------

***Geometry Calculator***

1.    Calculate the area of a Circle

2.    Calculate the area of a Rectangle

3.    Calculate the area of a Triangle

4.    Calculate the volume of a cylinder

5.    Quit

Enter your choice (1-5): 5 Quitting program now.

Thanks for using the Geometry Calculator!

Answer 1

import java.util.*;
import java.lang.*;
public class Main
{
public static void areaCircle(double r)
{
  
double a = Math.PI * r * r; //Caclulating the Area of Circle
System.out.printf("Area of Circle is:%.3f",a); //Printing the Area of Circle
  
}
public static void areaRectangle(double l,double w){
double a = l * w; //Caclulating the Area of Rectangle
System.out.printf("Area of Rectangle is:%.3f",a); //Printing the Area of Rectangle
}
public static void areaTriangle(double b,double h){
double a = 0.5 * b * h; //Caclulating the Area of Triangle
System.out.printf("Area of Triangle is:%.3f",a); //Printing the Area of Triangle
}
public static void volumeCylinder(double r,double h){
double v = Math.PI * r * r * h; //Caclulating the Volume of Cylinder
System.out.printf("Volume of Cylinder is:%.3f",v); //Printing the Volume of Cylinder
}
   public static void main(String[] args) {
       int ch;
       Scanner sc = new Scanner(System.in);
       System.out.println("***Geometry Calculator***"); //Printing the Menu
       System.out.println("1.Calculate the area of a Circle");
       System.out.println("2.Calculate the area of a Rectangle");
       System.out.println("3.Calculate the area of a Triangle");
       System.out.println("4.Calculate the volume of a Cylinder");
       System.out.println("5.Quit");
       System.out.println("Enter your choice(1-5): ");
       ch = sc.nextInt(); //Taking Choice from user
       switch (ch)
       {
       case 1: System.out.println("Enter the Radius of a Circle: ");
double r = sc.nextDouble(); //Taking Radius from user
if(r<0)
System.out.println("Invalid Radius");
else
       areaCircle(r);
       break;
       case 2:System.out.println("Enter the Length: ");
       double l = sc.nextDouble(); //Taking Length from user
       System.out.println("Enter the Width: ");
       double w = sc.nextDouble(); //Taking Width from user
       if(l<0 || w<0)
       System.out.println("Invalid Length or Width");
       else
       areaRectangle(l,w);
       break;
       case 3:System.out.println("Enter the Base: "); //Taking Base from user
       double b = sc.nextDouble();
       System.out.println("Enter the Height: "); //Taking Height from user
       double h = sc.nextDouble();
       if(b<0 || h<0)
       System.out.println("Invalid Base or Height");
       else
       areaTriangle(b,h);
       break;
       case 4:System.out.println("Enter the Radius: "); //Taking Radius from user
       double r1 = sc.nextDouble();
       System.out.println("Enter the Height: "); //Taking Height from user
       double h1 = sc.nextDouble();
       if(r1<0 || h1<0)
       System.out.println("Invalid Radius or Height");
       else
       volumeCylinder(r1,h1);
       break;
       case 5:System.exit(0);
       break;
       default:System.out.println("Invalid Choice"); //Default Statement
       }
       System.out.println("\nThanks for using Geometry Calculator!");
      
   }
}
Output:-