#include <cmath>
#include <iostream>

struct Point {
  double x;
  double y;
};

double distLength(double x1, double y1, double x2, double y2) {
  double xlength = x2 - x1, ylength = y2 - y1;
  return std::sqrt(xlength * xlength + ylength * ylength);
}

struct Point midpoint(double x1, double y1, double x2, double y2) {
  struct Point point;
  point.x = (x1 + x2) / 2;
  point.y = (y1 + y2) / 2;
  return point;

}
int main(void) {
  struct Point point = midpoint(-4.0, 2.0, 8.0, -3.0);
  std::cout << point.x << ", " << point.y << "\n";
  std::cout << distLength(-4.0, 2.0, 8.0, -3.0);
  return 0;
}