AreaCalculator.java

import java.util.*;

public class AreaCalculator {
 
	public static void main(String[] args) {
 
	 Scanner keyboard = new Scanner(System.in);
 
	 System.out.println("Shape Area Calculator");
	
	 while(true) {
 
	 System.out.println();
	 System.out.println("-=-=-=-=-=-=-=-=-=-");
	 System.out.println();
	 System.out.println("1) Triangle");
	 System.out.println("2) Rectangle");
	 System.out.println("3) Circle");
	 System.out.println("4) Quit");
 System.out.println();
 
	 System.out.print("Which shape: ");
	
 int shape = keyboard.nextInt();
	 System.out.println();
	
	
	 if (shape == 1) {
 System.out.print("Base: ");
		 int base = keyboard.nextInt();
	 	System.out.print("Height: ");
		 int height = keyboard.nextInt();
		 area_triangle(base, height);
	 } else if (shape == 2) {
 System.out.print("Length: ");
		 int length = keyboard.nextInt();
	 System.out.print("Width: ");
		 int width = keyboard.nextInt();
		 area_rectangle(length, width);
	 } else if (shape == 3) {
 System.out.print("Radius: ");
		 int radius = keyboard.nextInt();
	 	area_circle(radius);
	 } else if (shape == 4) {
		 quit();
		 break;
	 }

	 }
	 
	 keyboard.close();
	 
	 	
 }

	
 public static double area_triangle(int base, int height) {
		System.out.println();
		int A = (base * height) / 2;
		System.out.println("The area is " + A + ".");
 return A;
	}
	
 public static int area_rectangle(int length, int width){
		System.out.println();
		int A = length * width;
		System.out.println("The area is " + A + ".");
		return A;
	}
 
 public static double area_circle(int radius) {
		System.out.println();
		double A = Math.PI * radius * radius;
		System.out.println("The area is " + A + ".");
		return A;
	}
 
	public static String quit() {
		System.out.println("Good Bye");
		return null;
	}

	
}