Question

Write a program GreatCircle.java that takes four doubles x1, y1, x2, and y2 representing the latitude and longitude in degrees of two points on earth as command-line arguments and writes the great-circle distance (in km) between them, given by the equation

d = 111 arccos(sin(x1 ) sin(x2 ) + cos(x1 ) cos(x2 ) cos(y1 − y2 )).

Answer 1

//GreatCircle.java
public class GreatCircle {
    public static void main(String[] args) {
        if(args.length==4){
            int x1,y1,x2,y2;
            x1 = Integer.parseInt(args[0]);
            y1 = Integer.parseInt(args[1]);
            x2 = Integer.parseInt(args[2]);
            y2 = Integer.parseInt(args[3]);

            double d;
            d = 111 * Math.acos(Math.sin(x1) * Math.sin(x2) + Math.cos(x1) * Math.cos(x2) * Math.cos(y1 - y2 ));

            System.out.println("Distance ="+d);
        }
        else{
            System.out.println("Please pass 4 command line arguments");
        }
    }
}