02. Distance

#include<iostream>
#include<cmath>
using namespace std;

class Distance
{
    int x1, y1, x2, y2;
public:
    void get()
    {
        cin >> x1 >> y1 >> x2 >> y2;
    }
    void calc()
    {
        int coordination;
        double distance;
        coordination = (pow(x2 - x1, 2) + pow(y2 - y1, 2));
        distance = sqrt(coordination);
        cout.setf(ios::fixed);
        cout.precision(3);
        cout << distance << endl;
    }
};


int main()
{
    Distance output;
    output.get();
    output.calc();

    return 0;
}