// .
int[] ; // int lowerBound; // int upperBound; //
. RangeArray. lowerBound, upperBound.
Length Error.
// Length, public int Length { get; private set; }
// Error, public bool Error { get; private set; }
, set private. , , , .
RangeArray.
// , public RangeArray(int low, int high) { high++;
if(high <= low) {
Console.WriteLine(" ");
high = 1; //
low = 0;
}
= new int[high - low];
Length = high - low;
lowerBound = low; upperBound = high;
}
RangeArray low, high. high , low high . : . , , . , . Length . , lowerBound upperBound.
RangeArray , .
// RangeArray. public int this[int index] {
// get. get {
if(ok(index)) {
Error = false;
return a[index - lowerBound];
} else {
Error = true; return 0;
}
// set. set {
if(ok(index)) {
a[index - lowerBound] = value;
Error = false;
}
else Error = true;
}
}
, FailSof tArray, . , .
Index - lowerBound
, index, , . lowerBound: , .
ok ().
// true, // , private bool ok(int index) {
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if(index >= lowerBound & index <= upperBound) return true; return false;
}
FailSof tArray, , lowerBound upperBound.
RangeArray , . , , . , , , , . .
11
- , . , , . , , .
C# , , , , , . , . , , , , .
C# , . . . TwoDShape, , , , ..
// , class TwoDShape {
Public double Width;
Public double Height;
public void ShowDimO {
Console.WriteLine(" " +
Width + " " + Height);
}
}
TwoDShape , .. , . , TwoDShape Triangle. Triangle.
// , using System;
// . class TwoDShape {
public double Width; public double Height; public void ShowDimO {
Console.WriteLine(" " +
Width + " " + Height);
}
}
// Triangle, TwoDShape. class Triangle: TwoDShape {
public string Style; //
// , public double Area() {
return Width * Height / 2;
}
// , public void ShowStyleO {
Console.WriteLine(" " + Style);
}
}
class Shapes {
static void Main() {
Triangle tl = new Triangle(); Triangle t2 = new Triangle();
tl.Width = 4.0;
tl.Height = 4.0;
tl.Style = "";
t2.Width = 8.0;
t2.Height = 12.0;
t2.Style = "";
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