C# : . , . , . .
// // .
Using System;
class X {
Public int a;
public X(int i) { a = i;
}
}
class Y: X { public int b;
public Y(int i, int j): base(j) { b = i;
}
}
class BaseRef {
static void Main() {
X x = new X(10);
X x2;
Y = new Y (5, 6);
x2 = x; // , Console.WriteLine ("2.: " + 2.);
2 = ; // , Y X Console.WriteLine ("2.: " + 2.);
// X X 2. = 19; // // 2. = 27; // , b X }
}
Y X. :
2 = ; // , Y X
. ( 2 X) , .. , .
, , , . , , , . 2 b Y, . , , -
. .
-, . , , .
, . , , . . , . TwoDShape Triangle. , .
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// // .
Using System;
class TwoDShape { double pri_width; double pri_height;
// , public TwoDShape() {
Width = Height = 0.0;
}
// TwoDShape. public TwoDShape(double w, double h) {
Width = w;
Height = h;
}
// , public TwoDShape(double ) {
Width = Height = x;
}
// TwoDShape. public TwoDShape(TwoDShape ob) {
Width = ob.Width;
Height = ob.Height;
}
// , public double Width {
get { return pri_width; }
set { pri_width = value < 0? -value: value; }
}
get { return pri_height; }
set { pri_height = value < 0? -value: value; }
}
public void ShowDim() {
Console.WriteLine(" " +
Width + " " + Height);
}
}
// , 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;
}
// , public double Area() {
return Width * Height / 2;
}
// , public void ShowStyle() {
Console.WriteLine(" " + Style);
}
}
class Shapes7 {
static void Ma^n() {
Triangle tl = new Triangle("", 8.0, 12.0);
// tl.
Triangle t2 = new Triangle ('t*L);
Console.WriteLine(" tl: "); tl.ShowStyle();
Tl.ShowDim();
Console.WriteLine (" " + tl.AreaO);
Console.WriteLine ();
Console.WriteLine(" t2: "); t2.ShowStyle(); t2.ShowDim();
Console.WriteLine(" " + t2.Area());
}
}
t2 tin . ' .
tl:
