LAB 4
unknown
java
2 years ago
9.5 kB
5
Indexable
package geometry;
import java.util.Scanner;
/**
* This program demonstrates static methods
*/
public class Geometry {
public static void main(String[] args) {
//--------------------------------------------------
int choice; // The user's choice
double value = 0; // The method's return value
char letter; // The user's Y or N decision
double radius; // The radius of the circle
double length; // The length of the rectangle
double width; // The width of the rectangle
double height; // The height of the triangle
double base; // The base of the triangle
double side1; // The first side of the triangle
double side2; // The second side of the triangle
double side3; // The third side of the triangle
//--------------------------------------------------
// Create a scanner object to read from the keyboard
Scanner keyboard = new Scanner(System.in);
//--------------------------------------------------
// The do loop allows the menu to be displayed first
do {
//-----------------------------------------------------------TASK1
// TASK #1 Call the printMenu method
printMenu();
choice = keyboard.nextInt();
switch (choice) {
//--------------------------------------------------
case 1:
System.out.print("Enter the radius of "
+ "the circle: ");
radius = keyboard.nextDouble();
// TASK #3 Call the circleArea method and
// store the result in the value variable
value = circleArea(radius);
System.out.println("The area of the circle is " + value);
break;
//--------------------------------------------------
case 2:
System.out.print("Enter the length of the rectangle: ");
length = keyboard.nextDouble();
System.out.print("Enter the width of the rectangle: ");
width = keyboard.nextDouble();
// TASK #3 Call the rectangleArea method and
// store the result in the value variable
value = rectangleArea(length, width);
System.out.println("The area of the rectangle is " + value);
break;
//--------------------------------------------------
case 3:
System.out.print("Enter the height of the triangle: ");
height = keyboard.nextDouble();
System.out.print("Enter the base of the triangle: ");
base = keyboard.nextDouble();
// TASK #3 Call the triangleArea method and
// store the result in the value variable
value = triangleArea(height, base);
System.out.println("The area of the triangle is " + value);
break;
//--------------------------------------------------
case 4:
System.out.print("Enter the radius of the circle: ");
radius = keyboard.nextDouble();
// TASK #3 Call the circumference method and
// store the result in the value variable
value = circumference(radius);
System.out.println("The circumference of the circle is " + value);
break;
//--------------------------------------------------
case 5:
System.out.print("Enter the length of "
+ "the rectangle: ");
length = keyboard.nextDouble();
System.out.print("Enter the width of "
+ "the rectangle: ");
width = keyboard.nextDouble();
// TASK #3 Call the perimeter method and
// store the result in the value variable
value = rectanglePerimeter(length, width);
System.out.println("The perimeter of the rectangle is " + value);
break;
//--------------------------------------------------
case 6:
System.out.print("Enter the length of side 1 of the "
+ "triangle: ");
side1 = keyboard.nextDouble();
System.out.print("Enter the length of side 2 of the "
+ "triangle: ");
side2 = keyboard.nextDouble();
System.out.print("Enter the length of side 3 of the "
+ "triangle: ");
side3 = keyboard.nextDouble();
// TASK #3 Call the perimeter method and
// store the result in the value variable
value = trianglePerimeter(side1, side2, side3);
System.out.println("The perimeter of " + "the triangle is " + value);
break;
//--------------------------------------------------
default:
System.out.println("You did not enter "
+ "a valid choice.");
}
keyboard.nextLine(); // Consume the new line
System.out.println("Do you want to exit the program (Y/N)?: ");
String answer = keyboard.nextLine();
letter = answer.charAt(0);
} while (letter != 'Y' && letter != 'y');
}
//-----------------------------------------------------------TASK1
// TASK #1 Create the printMenu method here
/**
* This method prints the available options to the user
* It does not have a parameter list and does not return a value
*/
public static void printMenu(){
System.out.println("This is geometry caclulator");
System.out.println("Choose vhat you like to caculate");
System.out.println("1. Find area of Circle");
System.out.println("2. Find area of a Rectangle");
System.out.println("3. Find area of a Triangle");
System.out.println("4. Find circumfrence of Circle");
System.out.println("5. Find perimeter of a rectangle");
System.out.println("6. Find perimeter of triangle");
}
//-----------------------------------------------------------TASK2
// TASK #2 Create the value-returning methods here
/**
* This method calculates the area of a circle
* It takes a double value as a parameter and returns another double value
* @param r Circle Radius
* @return Area of circle
*/
public static double circleArea(double r){
double area;
area = Math.PI*Math.pow(r, 2);
return area;
}
/**
* This method calculates the Area of a rectangle
* it takes two double values as parameters and returns another double value
* @param l Length of Rectangle
* @param w Width of Rectangle
* @return Area of Rectangle
*/
public static double rectangleArea(double l, double w){
double area;
area = l*w;
return area;
}
/**
* this method calculates the area of a triangle
* it takes two double values as parameters and returns another double value
* @param h Height of Triangle
* @param b Base of Triangle
* @return Area of Triangle.
*/
public static double triangleArea(double h, double b){
return (h/b) * 0.5;
}
/**
* this method calculates the circumference of a circle.
* it takes a double value as parameters and returns another double value.
* @param r Circle Radius.
* @return Circumference of circle.
*/
public static double circumference(double r){
return 2*Math.PI*r;
}
/**
* this method calculates the perimeter of a rectangle.
* it takes two double values as parameters and returns another double value.
* @param l Length of Rectangle.
* @param w Width of Rectangle.
* @return Perimeter of Rectangle.
*/
public static double rectanglePerimeter(double l, double w){
return (2*l) + (2*w);
}
/**
* this method calculates the perimeter of a triangle.
* it takes three double values as parameters and returns another double.
* @param a Length of side1 of Triangle.
* @param b Length of side2 of Triangle.
* @param c Length of side3 of Triangle.
* @return Perimeter of Triangle.
*/
public static double trianglePerimeter(double a, double b, double c){
return a + b + c;
}
//-----------------------------------------------------------TASK1
// TASK #4 Write javadoc comments for each method
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