prog7.cpp

来自「C++语言程序设计题典」· C++ 代码 · 共 39 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;
	}
	friend double operator+(double d,Triangle t)
	{
		return d+t.area;
	}
};
void main()
{
	Triangle t1(3,4,5),t2(4,5,6),t3(5,6,7),t4(6,7,8);
	double s;
	cout << "t1:";t1.disparea();
	cout << "t2:";t2.disparea();
	cout << "t3:";t4.disparea();
	cout << "t4:";t4.disparea();
	s=t1+t2+t3+t4;
	cout << "总面积=" << s << endl;
}