C++ 计算两点间距离 - 线段长度算法

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

using namespace std;

int main() {
    double xa, ya, xb, yb;
    cin >> xa >> ya;
    cin >> xb >> yb;
    
    double length = sqrt(pow(xb - xa, 2) + pow(yb - ya, 2));
    cout << fixed << setprecision(3) << length << endl;
    
    return 0;
}