下面为一个点类,重载了负号运算符,将原来点改为其关于原点的对称点。 请填空补充完整程序。 #include [iostream.h][br][/br] class Point{ private: float x; float y; public: Point(){ x = 0; y = 0; } Point(float a, float b){ x = a; y = b; } // 显示坐标 void display() { cout << "X: " << x << " Y:" << y <
举一反三
- 有以下程序: #include <iostream> #include <cmath> using namespace std; class Distance; class point { public: friend class Distance; Point(int a,int B) { x=a; Y=b; } void Print() { cout<<"X= "<<X<<end1; cout<<"Y= "<<Y<<end1; } private: float X,Y; }; class Distance { public: float Dis(Point &p,Point &q); }; float Distance :: Dis(Point &p,Point &q) { float result; result=sqrt((p.X-q.X)*(p.X-q.X)+(p.Y-q.Y)*(p.Y-q.Y)); cout<<result<<end1; retUrn result; } int main() { Point p(10,10),q(10,30); Distance d; d.Dis(p,q); return 0; } 运行后的输出结果是( )。 A: 10 B: 30 C: 0 D: 20
- 已知 Point类,要求在该类中完成+,- 两种操作符的重载。(重写Point类)class Point{ public: Point(float x=0, float y=0, float z=0): xx(x), yy(y), zz(z){} Point(const Point& p): xx(p.xx), yy(p.yy), zz(p.zz){ } private: float xx, yy, zz;}……
- 有如下类的定义[br][/br] public class Point { int x;[br][/br] int y;[br][/br] public void show(){ System.out.println("x="+x+",y="+y)[br][/br] }[br][/br] public Point(){[br][/br] }[br][/br] public Point(int x , int y){ this.x = x;[br][/br] this.y = y;[br][/br] }[br][/br] } Point p1 = new Point(); Point p2 = new Point(); Point p3 = new Point(1,1); 关于创建的对象说法不正确的是() A: p1==p2的值是true B: p1.show()的输出结果是x=0,y=0 C: p3.show()输出的结果是x=1,y=1 D: p1.x = 10,是将p1对象的x属性赋值为10,不能改变p2和p3对象的x属性值。
- 8.5 阅读程序,写出运行结果 class Point{ int x=1; static int y=2; public void show(){System.out.println(x+","+y); }} public class tempDemo{ public static void main(String []args){ Point p1=new Point();p1.show(); p1.x=2;p1.y=3; Point p2=new Point();p2.show(); p1.show(); p1.y=5; p2.show(); }}
- 中国大学MOOC: 有以下类定义class Point {public: Point(int x = 0, int y = 0) { _.x = x; _.y = y; } void Move(int xOff, int yOff) { _x += xOff; _.y += yOff; } void Print() const { cout << ( << _x << , << _y << ) << endl; }private: int _x, _y;};下列语句中会发生编译错误的是