/* * * * * * * * * * * * * * * * * * * * * * * * *
  Name:
  Section:
* * * * * * * * * * * * * * * * * * * * * * * * */

// include necessary libraries

/* * * * * * * * * * * * * * * * * * * * * * * * *
  This program will calculate the distance between
    two points.
  d = square root of ((x1 - x2)^2 + (y1 - y2)^2)
* * * * * * * * * * * * * * * * * * * * * * * * */
int main() {
  // declare necessary variables

  // ask for input (x1, x2, y1, y2)

  // calculate distance

  // output distance

  return 0;
}