[distance between two points]

#include <iostream>
#include <cmath>

using namespace std;

double pointDist (double x1, double y1, double x2, double y2)
{
    double square_x = (x1 - x2) * (x1 - x2);
    double square_y = (y1 - y2) * (y1 - y2);
    double distance = sqrt(square_x + square_y);

 return distance;

} //dist

int main()
{
    cout << "x1;y1: ";
    double x1, y1;
    cin >> x1 >> y1;
    cout << "x2;y2: ";
    double x2, y2;
    cin >> x2 >> y2;

    cout << "Distance: " << pointDist(x1, y1, x2, y2) << endl;

 return 0;
}//main