Define a Point class with two data members: x and y, which represent the x-coordinate and y-coordinate respectively, and have several member functions. Define a function Distance() to find the distance between two points.
Input format:
The input has two lines: the first line is the x and y coordinates of the first point; the second line is the x and y coordinates of the second point.
Output format:
Outputs the distance between two points with two decimal places.
Input sample:
0 9 3 -4
Sample output:
13.34