题解 | 点的距离

#include <iostream>
#include <cmath>
#include <iomanip>

using namespace std;

class CPoint{
    private:
    double x, y;

    public:
    CPoint(double p = 0,double q = 0) : x(p), y(q){};

    double operator-(const CPoint &other) const{
        return sqrt(pow(x - other.x, 2) + pow(y - other.y, 2));
    }
};

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int m;
    cout << fixed << setprecision(2);
    while(cin >> m){
        for(int i = 0; i < m; i++){
            double ax, ay, bx, by;
            cin >> ax >> ay >> bx >> by;
            CPoint a(ax, ay);
            CPoint b(bx, by);
            cout << a - b << "\n";
        }
    }
    return 0;
}