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;
	}

	
}