C++实例---构造函数的重载

运行环境：macOS shell
代码：

#include <iostream>#include <iomanip>#include <string>using namespace std;class point{private:    double fx, fy;public:    point();    point(double x, double y);    void showpoint();};point::point(){    fx = 0.0;    fy = 0.0;}point::point(double x, double y = 5.5){    fx = x;    fy = y;}void point::showpoint(){    cout<<fx<<"  "<<fy<<endl;}int main (){    point p1;    cout<<"the fx and fy of p1 : ";    p1.showpoint();    point p2(10);    cout<<"the fx and fy of p2 : ";    p2.showpoint();    point p3(1.1,2.0);    cout<<"the fx and fy of p3 : ";    p3.showpoint();    return 0;}

运行结果：