Dist_pontos.cpp

#include <bits/stdc++.h>
using namespace std;

struct ponto
{
    int x, y;
    
    double dist(ponto q)
    {
        int r1 = x - q.x;
        int r2 = y - q.y;
        return sqrt(r1*r1 + r2*r2);
    }
  
};

int main()
{
    ponto a, b;
    cin >> a.x >> a.y >> b.x >> b.y;
    cout << a.dist(b) << endl;
}