main6.java

/**
 * Farahim Ibrahimli
 * Homework 1 Question 6
 *
 */

import java.util.Scanner;

public class Question6 {

	 private static Scanner in = new Scanner(System.in);


	    public static double readDouble(String prompt) {
	        System.out.print(prompt);
	        return in.nextDouble();
	    }

	    public static double calculateDistance(double startX, double startY, double endX, double endY) {
	        return Math.sqrt(Math.pow(startX - endX, 2) + Math.pow(startY - endY, 2));
	    }

	    public static boolean isOverlapping(double aX, double aY, double aR, double bX, double bY, double bR) {
	        return calculateDistance(aX, aY, bX, bY) < Math.abs(aR + bR);
	    }

	    public static boolean isTouching(double aX, double aY, double aR, double bX, double bY, double bR) {
	        return calculateDistance(aX, aY, bX, bY) == Math.abs(aR + bR);
	    }

	    public static boolean isInside(double aX, double aY, double aR, double bX, double bY, double bR) {
	        double distance = calculateDistance(aX, aY, bX, bY);

	        return distance + aR <= bR;
	    }

	    public static void main(String[] args) {
	        double aX = readDouble("Enter Circle A X-Coordinate: ");
	        double aY = readDouble("Enter Circle A Y-Coordinate: ");
	        double aR = readDouble("Enter Circle A Radius: ");

	        double bX = readDouble("Enter Circle B X-Coordinate: ");
	        double bY = readDouble("Enter Circle B Y-Coordinate: ");
	        double bR = readDouble("Enter Circle B Radius: ");

	        if(isTouching(aX, aY, aR, bX, bY, bR)) {
	            System.out.println("They are touching");
	        } else if(isInside(aX, aY, aR, bX, bY, bR)) {
	            System.out.println("A is inside B");
	        } else if(isInside(bX, bY, bR, aX, aY, aR)) {
	            System.out.println("B is inside A");
	        } else if(isOverlapping(aX, aY, aR, bX, bY, bR)) {
	        	System.out.println("They are overlapping");
	        } else {
	            System.out.println("They are separate");
	        }
	    }

}