/*类型转换函数一般用于将类型转换为基本数据类型，但也可以转换为构造类型，如下*/
#include <stdlib.h>
#include<iostream>
#include <stdio.h>
#include<cmath>
using namespace std;
class Point
{
private:
double x;
public:
Point(double a= 0):x(a){};
void Show(){cout<<"x:"<<x<<endl;}
};
class A
{
protected:
double a;
public:
A(double x =0):a(x){}
double Geta(){return a;}
};
class B: public A
{
public:
B(double x= 0):A(x){}
operator Point(){
return Point(Geta());
}
};
int main()
{
B obj1(18);
Point obj2=obj1;//可以隐式调用
//Point obj2=obj1.operator Point();//也可以显示调用
obj2.Show();
return 0;
}