/*************************************************
Distance between points

Write a program that readsin two points (x1,y1) 
and (x2,y2) and prints out the distance between 
the two points.  Write and use a function
distance(x1,y1,x2,y2) to help you do this.

*************************************************/
#include <iostream>
using namespace std;

double distance(double,double,double,double);

int main()
{
  // Get coordinates
  char c;
  double x1, y1, x2, y2;
  cout << "Enter point 1: ";
  cin >> c >> x1 >> c >> y1 >> c;
  cout << "Enter point 2: ";
  cin >> c >> x2 >> c >> y2 >> c;

  // Write distance
  cout << "The distance between the points is "
       << distance(x1,y1,x2,y2) << endl;

  return 0;
}

/***********************************
 ** distance between two points
 ***********************************/
double distance(double x1, double y1, double x2, double y2)
{
  double X = x1 - x2, Y = y1 - y2;
  return sqrt(X*X + Y*Y);
}