Shulou(Shulou.com)06/01 Report--

This article will explain in detail what Youyuan means in C++. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

one。 Friend function

A friend function can be a normal function or a class member function.

Let's first take a look at the ordinary function declared as a friend function:

As follows:

# include # include using namespace std;class Point {/ / ordinary function is declared as the friend function of the class friend double TwoPointsDistant (const Point& pnt1, const Point& pnt2); public: Point (double x, double y): _ x (x), _ y (y) {} double getPointXAxis () const {return this- > _ x;} double getPointYAxis () const {return this- > _ y } private: double _ x; double _ y;}; / / calculate the distance between two points double TwoPointsDistant (const Point& pnt1, const Point& pnt2) {return sqrt (pow ((pnt1._x-pnt2._x), 2) + pow ((pnt1._y-pnt2._y), 2));} int main () {Point point1 (1.1d2.2); Point point2 (3.3,4.4) Cout 0) cout

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