运算符.cpp

关于如何用C语言编写重载的例子

#include "head.h"
MyCircle::MyCircle()
{
	centerX=0;
	centerY=0;
	radius=0;
}
double MyCircle::area()
{
	double area;
	area=3.14159*radius*radius;
	cout<<"area="<<area<<endl;
	return area;
}
istream &operator>>(istream&is,MyCircle&circle)
{
	cout<<"请输入centerX"<<endl;
	cin>>circle.centerX;
	cout<<"请输入centerY"<<endl;
	cin>>circle.centerY;
	cout<<"请输入radius"<<endl;
	cin>>circle.radius;
	return is;
}
MyRectangle::MyRectangle()
{
	length=0;
	width=0;
}
double MyRectangle::area()
{
	double area;
	area=length*width;
	cout<<"area="<<area<<endl;
	return area;
}
istream &operator>>(istream &is,MyRectangle &rectangle)
{
	cout<<"rectangle.length"<<endl;
	is>>rectangle.length;
	cout<<"rectangle.width"<<endl;
	is>>rectangle.width;
	return is;
}
void main()
{
	MyCircle circle;
	MyRectangle rectangle;
	cin>>circle;
	circle.area();
	cin>>rectangle;
	rectangle.area();
}