Given:Which code, inserted at line 15, creates an instance of the Point class defined in Line?() A.Point p = new Point();B.Line.Point p = new Line.Point();C.The Point class cannot be instatiated at line 15.D.Line l = new Line() ; l.Point p = new l.Point();
Given:Which code, inserted at line 15, creates an instance of the Point class defined in Line?()
A.Point p = new Point();
B.Line.Point p = new Line.Point();
C.The Point class cannot be instatiated at line 15.
D.Line l = new Line() ; l.Point p = new l.Point();
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classLine{11.publicstaticclassPoint{}12.}13.14.classTriangle{15.／／insertcodehere16.}Whichcode,insertedatline15,createsaninstanceofthePointclassdefinedinLine?() A.Pointp=newPoint（）；B.Line.Pointp=newLine.Point（）；C.ThePointclasscannotbeinstatiatedatline15.D.Line1=newLine（）；1.Pointp=new1.Point（）；
阅读下列C++程序和程序说明，将应填入(n)处的字句写在对应栏内。【说明】Point是平面坐标系上的点类，Line是从Point派生出来的直线类。include ＜iostream.h＞class Point{public:Point (int x, int y) ;Point (Point p) ;～Point();void set (double x, double y) ;void print();private:double X,Y;};Point::Point (int x, int y) //Point 构造函数{X=x; Y=y; }Point::Point ( (1) ) //Point 拷贝构造函数{X=p.X; Y=p.Y；}void Point::set (double x, double y){X=x; Y=y; }void Point::print(){cout＜＜' ('＜＜X＜＜","＜＜Y＜＜") "＜＜endl; }Point::～Point(){cout＜＜"Point 的析构函数被调用! "＜＜endl;class Line: public Point{public:Line (int x, int y, int k) ;Line (Line s) ;～Line();void set (double x, double y, double k)void print();private:double K;};(2)//Line 构造函数实现{ K=k;}(3)//Line 拷贝构造函数实现{K=s.K;}void Line::set (double x, double y, double k){ (4);K=k;}void Line::print(){cout＜＜" 直线经过点";(5);cout＜＜"斜率为: k="＜＜K＜＜endl;}Line: :～Line(){cout＜＜"Line 析构函数被调用! "＜＜endl;}void main(){Line 11 (1,1,2) ;11 .print();Linel2 (11) ;12.set (3,2,1) ;12.print();}
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