设计并测试Trapezium类 代码参考

#include <iostream>

using namespace std;

class Trapezium
{
    private:
        int x1,y1,x2,y2,x3,y3,x4,y4;
    public:
        void initial(){x1=0,x2=0;x3=0;x4=0;y1=0;y2=0;y3=0;y4=0;return;}
        void GetPosition(int&,int&,int&,int&,int&,int&,int&,int&);
        void Area()
        {
            double s;
            s=((x2-x1)+(x4-x3))*(y2-y4)/2.0;
            cout<<s<<endl;
            return;
        }
};

void Trapezium::GetPosition(int& a,int& b,int& c,int& d,int& e,int& f,int& g,int& h)
{
    x1=a;y1=b;x2=c;y2=d;x3=e;y3=f;x4=g;y4=h;
    return;
}

int main()
{
    int x[4],y[4];
    Trapezium one;
    for(int i=0;i<4;i++)    cin>>x[i]>>y[i];
    one.initial();
    one.GetPosition(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]);
    one.Area();
    return 0;
}