1. 设计立方体类
设计立方体类(Cube)，求出立方体的面积( 2*a*b + 2*a*c + 2*b*c )和体积( a * b * c)，分别用全局函数和成员函数判断两个立方体是否相等。
//立方体类 class Cub{ public: void setL(int l){ mL = l; } void setW(int w){ mW = w; } void setH(int h){ mH = h; } int getL(){ return mL; } int getW(){ return mW; } int getH(){ return mH; } //立方体面积 int caculateS(){ return (mL*mW + mL*mH + mW*mH) * 2; } //立方体体积 int caculateV(){ return mL * mW * mH; } //成员方法 bool CubCompare(Cub& c){ if (getL() == c.getL() && getW() == c.getW() && getH() == c.getH()){ return true; } return false; } private: int mL; //长 int mW; //宽 int mH; //高 }; //比较两个立方体是否相等 bool CubCompare(Cub& c1, Cub& c2){ if (c1.getL() == c2.getL() && c1.getW() == c2.getW() && c1.getH() == c2.getH()){ return true; } return false; } void test(){ Cub c1, c2; c1.setL(10); c1.setW(20); c1.setH(30); c2.setL(20); c2.setW(20); c2.setH(30); cout << "c1面积:" << c1.caculateS() << " 体积:" << c1.caculateV() << endl; cout << "c2面积:" << c2.caculateS() << " 体积:" << c2.caculateV() << endl; //比较两个立方体是否相等 if (CubCompare(c1, c2)){ cout << "c1和c2相等!" << endl; } else{ cout << "c1和c2不相等!" << endl; } if (c1.CubCompare(c2)){ cout << "c1和c2相等!" << endl; } else{ cout << "c1和c2不相等!" << endl; } }
2. 点和圆的关系
设计一个圆形类（AdvCircle），和一个点类（Point），计算点和圆的关系。
假如圆心坐标为x0, y0, 半径为r，点的坐标为x1, y1：
- 在圆上：(x1-x0)(x1-x0) + (y1-y0)(y1-y0) == r*r
- 点在圆内：(x1-x0)(x1-x0) + (y1-y0)(y1-y0) < r*r
- 点在圆外：(x1-x0)(x1-x0) + (y1-y0)(y1-y0) > r*r
//点类 class Point{ public: void setX(int x){ mX = x; } void setY(int y){ mY = y; } int getX(){ return mX; } int getY(){ return mY; } private: int mX; int mY; }; //圆类 class Circle{ public: void setP(int x,int y){ mP.setX(x); mP.setY(y); } void setR(int r){ mR = r; } Point& getP(){ return mP; } int getR(){ return mR; } //判断点和圆的关系 void IsPointInCircle(Point& point){ int distance = (point.getX() - mP.getX()) * (point.getX() - mP.getX()) + (point.getY() - mP.getY()) * (point.getY() - mP.getY()); int radius = mR * mR; if (distance < radius){ cout << "Point(" << point.getX() << "," << point.getY() << ")在圆内!" << endl; } else if (distance > radius){ cout << "Point(" << point.getX() << "," << point.getY() << ")在圆外!" << endl; } else{ cout << "Point(" << point.getX() << "," << point.getY() << ")在圆上!" << endl; } } private: Point mP; //圆心 int mR; //半径 }; void test(){ //实例化圆对象 Circle circle; circle.setP(20, 20); circle.setR(5); //实例化点对象 Point point; point.setX(25); point.setY(20); circle.IsPointInCircle(point); }
