1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
| using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
abstract class OperSuper
{
public abstract double GetResult(double a, double b);
}
class Add : OperSuper
{
public override double GetResult(double a, double b)
{
return a + b;
}
}
class Minus : OperSuper
{
public override double GetResult(double a, double b)
{
return a - b;
}
}
class Context
{
OperSuper os = null;
double A, B;
public Context(OperSuper o, double a, double b)
{
os = o;
A = a;
B = b;
}
public double GetResult()
{
return os.GetResult(A, B);
}
}
class client
{
public static void Main()
{
Context c = new Context(new Add(), 10, 20);
Console.WriteLine(c.GetResult());
c = new Context(new Minus(), 20, 10);
Console.WriteLine(c.GetResult());
}
}
}
|