Write a method called distance that (1) accepts four integer coordinates: x1, y1, x2, y2 as parameters, (2) computes the distance between points (x1, y1) and (x2, y2) on the map, and (3) returns that distance.
The equation for the distance is: sqrt ((x2 - x1)2 + (y2 - y1)2).
Test out your program by writing a main method that calls the distance method for each of the following pairs of cities. Your main method should output the value returned by the distance method.
