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: virtual override. .
C# . - , , , . C# : .
, , . , . , . , , , .
, TwoDShape. , TwoDShape, Area (). , -, Area () TwoDShape , . . TwoDShape.
// -.
Using System;
class TwoDShape { double pri_width; double pri_height;
// , public TwoDShape() {
Width = Height = 0.0; name = "null";
}
// .'
public TwoDShape(double w, double h, string n) {
Width = w;
Height = h; name = n;
}
// , public TwoDShape(double , string n) {
Width = Height = x; name = n;
}
// TwoDShape. public TwoDShape(TwoDShape ob) {
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|
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Width = ob.Width;
Height = ob.Height; name = ob.name;
}
// , public double Width {
get { return pri_width; }
set { pri_width = value < 0? -value: value; }
}
public double Height {
get { return pri_height; }
set -{ pri_height = value < 0? -value: value; }
}
public string name { get; set; }
public void ShowDim() {
Console.WriteLine(" " +
Width + " " + Height);
}
public virtual double Area() {
Console.WriteLine(" Area() "); return 0.0;
}
}
// , TwoDShape.
class Triangle: TwoDShape { string Style;
// , , public Triangle() {
Style = "null";
}
// Triangle, public Triangle(string s, double w, double h): base (w, h, "") {
Style = s;
}
// , public Triangle(double x): base(x, "") {
Style = "";
}
// Triangle, public Triangle(Triangle ob): base(ob) {
Style = ob.Style;
}
// Area() Triangle, public override double Area() { return Width * Height / 2;
}
// , public void ShowStyle() {
Console.WriteLine(" " + Style);
}
I/ , TwoDShape. class Rectangle: TwoDShape {
// Rectangle, public Rectangle(double w, double h): base (w, h, "") { }
// , public Rectangle(double x): base(x, "") { }
// Rectangle, public Rectangle(Rectangle ob): base(ob) { }
// true, // , public bool IsSquareO {
if(Width == Height) return true; return false;
}
// Area() Rectangle, public override double Area() { return Width * Height;
}
}
class DynShapes {
static void Main() {
TwoDShape[] shapes = new TwoDShape[5];
shapes[0] = new Triangle("", 8.0, 12.0); shapes[1] = new Rectangle(10);
shapes[2] = new Rectangle(10, 4);
shapes[3] = new Triangle(7.0);
shapes[4] = new TwoDShape(10, 20, " ");
for (int i=0; i < shapes.Length; i++) {
Console.WriteLine(" " + shapes[i].name);
Console.WriteLine(" " + shapes[i].Area());
Console.WriteLine();
}
}
}
