帮忙看个小程序c++

   #include<iostream>
   using namespace std;
   class vector
   {
   public:
       vector(float nx,float ny)
       {
           x=nx;y=ny;
       };//构造函数
      float Add( );//计算加法运算
      float Sub( );//计算减法运算
      float Mult( );//乘法运算
   private:
       float x,y;
   };
   
   float vector::Add( )//加法功能函数
   {
       return x+=ob2.x,y+=ob2.y;
   }
   float vector::Sub( )// 加法功能函数
   {
       return x-=ob2.x,y-=ob2.y;
   }
   float  vector::Mult( )//乘法功能函数
   {
       return x*=ob2.x,y*=ob2.y;
   }
    float getx(vector ob)//类外访问数据成员函数
    {
        return x;
    }
    float gety(vector ob )//类外访问数据成员函数
    {
        return y;
    }

    float main()
    {
        float nx,ny;
        cout<<"输入第一个矢量数的x和y值"<<endl;
        cin>>nx>>ny;
        vector ob1;
        cout<<"类外访问第一个矢量的值是："<<endl;
        getx(ob1);
        gety(ob1);

        cout<<"输入第二个矢量数的x和y值"<<endl;
        cin>>nx>>ny;
        vector ob2;
        cout<<"类外访问第二个矢量的值是："<<endl;
        getx(ob2);
        gety(ob2);

        cout<<"jiafa"<<endl;
        ob1.Add(const Vector &ob2);
        cout<<x<<y<<endl;

        cout<<"jianfa"<<endl;
        ob1.Sub(const Vector &ob2);
        cout<<x<<y<<endl;

        cout<<"chenfa"<<endl;
        Mult(const Vector &ob2);
        cout<<x<<y<<endl;
    }


[ 本帖最后由 longzhixuan 于 2010-10-26 16:32 编辑 ]