9_1.cpp

来自「为初学者提供的最佳的C++程序设计源程序库」· C++ 代码 · 共 33 行

#include<iostream.h>
#include<math.h>
class Triangle
{
	int x,y,z;
	double area;
public:
	Triangle(int i,int j,int k)
	{
		double s;
		x=i;y=j;z=k;
		s=(x+y+z)/2.0;
		area=sqrt(s*(s-x)*(s-y)*(s-z));
	}
	void disparea()
	{
		cout<<"Area="<<area<<endl;
	}
	friend double operator+(Triangle t1,Triangle t2)
	{
		return t1.area+t2.area;
	}
};
void main()
{
	Triangle t1(3,4,5),t2(5,12,13);
	double s;
	cout<<"t1:";t1.disparea();
	cout<<"t2:";t2.disparea();
	s=t1+t2;
	cout<<"总面积：="<<s<<endl;
}