正文

C#实现的24点游戏实例详解

︶ㄣSDDLL学院 メ
SDDLL学院V管理员 / 阅读
0708
这篇文章主要介绍了C#实现的24点游戏,较为详细的分析了24点游戏的算法原理与实现技巧,具有一定参考借鉴价值,需要的朋友可以参考下

这篇文章主要介绍了C#实现的24点游戏,较为详细的分析了24点游戏的算法原理与实现技巧,具有一定参考借鉴价值,需要的朋友可以参考下

本文实例分析了C#实现的24点游戏。分享给大家供大家参考。具体如下：

1. 24点游戏规则及算法

规则：给出4个自然数，找出能够求出24的四则运算式，要求数字不能重复使用
分析：

本算法是一种暴力求解法：

给出任意两个数字，可以进行6种四则运算，求出最多6个值。以数字a和b为例，有：

加（a+b）、减（a-b）、被减（b-a）、乘以（a*b）、除以(a/b)和除(b/a)
abcd共计四个数，如果顺序固定，则有5种计算顺序（★代表上面6种四则运算中的一种）：

((a★b)★c)★d、(a★b)★(c★d)、(a★(b★c))★d、a★((b★c)★d)、a★(b★(c★d))

给出的四个数字，n1n2n3n4，有4*3*2=24种全排列的方法

2. 相关函数

?
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
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
/// <summary>
/// 判断abcd四个数进行任意四则运算后能不能得出24，每个数字只能用一次
/// </summary>
/// <param name="a">数字a</param>
/// <param name="b">数字b</param>
/// <param name="c">数字c</param>
/// <param name="d">数字d</param>
/// <param name="expression"></param>
/// <returns></returns>
private static bool Try24(int a, int b, int c, int d, ref string expression)
{
 //a字头
 if (TryEach(a, b, c, d, ref expression)) return true;
 if (TryEach(a, b, d, c, ref expression)) return true;
 if (TryEach(a, c, b, d, ref expression)) return true;
 if (TryEach(a, c, d, b, ref expression)) return true;
 if (TryEach(a, d, b, c, ref expression)) return true;
 if (TryEach(a, d, c, b, ref expression)) return true;
 //b字头
 if (TryEach(b, a, c, d, ref expression)) return true;
 if (TryEach(b, a, d, c, ref expression)) return true;
 if (TryEach(b, c, a, d, ref expression)) return true;
 if (TryEach(b, c, d, a, ref expression)) return true;
 if (TryEach(b, d, a, c, ref expression)) return true;
 if (TryEach(b, d, c, a, ref expression)) return true;
 //c字头
 if (TryEach(c, a, b, d, ref expression)) return true;
 if (TryEach(c, a, d, b, ref expression)) return true;
 if (TryEach(c, b, a, c, ref expression)) return true;
 if (TryEach(c, b, c, a, ref expression)) return true;
 if (TryEach(c, d, a, b, ref expression)) return true;
 if (TryEach(c, d, b, a, ref expression)) return true;
 //d字头
 if (TryEach(d, a, b, c, ref expression)) return true;
 if (TryEach(d, a, c, b, ref expression)) return true;
 if (TryEach(d, b, a, c, ref expression)) return true;
 if (TryEach(d, b, c, a, ref expression)) return true;
 if (TryEach(d, c, a, b, ref expression)) return true;
 if (TryEach(d, c, b, a, ref expression)) return true;
 return false;
}
/// <summary>
/// 判断指定顺序的四个数abcd进行任意四则运算后能不能得出24，每个数字只能用一次
/// </summary>
/// <param name="a">数字1</param>
/// <param name="b">数字2</param>
/// <param name="c">数字3</param>
/// <param name="d">数字4</param>
/// <param name="expression"></param>
/// <returns></returns>
private static bool TryEach(int a, int b, int c, int d, ref string expression)
{
 expression = "";
 //两个数可以做6种运算：加、减、被减、乘以、除以、除
 //四个数共可以进行6*6*6=216种不同次序的四则运算
 //初始化数组
 for (int i = 0; i < 6 * 6 * 6; i++)
 {
  //a与b间的运算符：i / 36
  //b与c间的运算符：i % 36 / 6
  //c与d间的运算符：i % 6
  //1.运算顺序：a和b，再和c，再和d
  {
   string expression1 = "", expression2 = "";
   int temp1 = ResultOf(a, b, i / 36, ref expression1);
   int temp2 = ResultOf(temp1, c, i % 36 / 6, ref expression2, expression1);
   int result = ResultOf(temp2, d, i % 6, ref expression, expression2);
   if (result == 24) return true;
  }
  //2.运算顺序：a和b，c和d，前面部分和后面部分
  {
   string expression1 = "", expression2 = "";
   int temp1 = ResultOf(a, b, i / 36, ref expression1);
   int temp2 = ResultOf(c, d, i % 6, ref expression2);
   int result = ResultOf(temp1, temp2, i % 36 / 6,
    ref expression, expression1, expression2);
   if (result == 24) return true;
  }
  //3.运算顺序：b和c运算，再与a运算，再与d运算
  {
   string expression1 = "", expression2 = "";
   int temp1 = ResultOf(b, c, i % 36 / 6, ref expression1);
   int temp2 = ResultOf(a, temp1, i / 36, ref expression2, "", expression1);
   int result = ResultOf(temp2, d, i % 6, ref expression, expression2);
   if (result == 24) return true;
  }
  //4.运算顺序：b和c运算，再与d运算，再与a运算
  {
   string expression1 = "", expression2 = "";
   int temp1 = ResultOf(b, c, i % 36 / 6, ref expression1);
   int temp2 = ResultOf(temp1, d, i % 6, ref expression2, expression1);
   int result = ResultOf(a, temp2, i / 36, ref expression, "", expression2);
   if (result == 24) return true;
  }
  //5.运算顺序：c和d运算，再和b运算，再和a运算
  {
   string expression1 = "", expression2 = "";
   int temp1 = ResultOf(c, d, i % 6, ref expression1);
   int temp2 = ResultOf(b, temp1, i % 36 / 6, ref expression2, "", expression1);
   int result = ResultOf(a, temp2, i / 36, ref expression, "", expression2);
   if (result == 24) return true;
  }
 }
 expression = "Abandoned";
 return false;
}
/// <summary>
/// 求两数进行某一四则运算后的结果
/// </summary>
/// <param name="x">数字1</param>
/// <param name="y">数字2</param>
/// <param name="method">（0-5分别代表：加、减、被减、乘以、除以、除）</param>
/// <param name="expression">返回的表达式</param>
/// <param name="expressionLeft">数字1表达式</param>
/// <param name="expressionRight">数字2表达式</param>
/// <returns></returns>
private static int ResultOf(int x, int y, int method,
 ref string expression, string expressionLeft = "", string expressionRight = "")
{
 //左右表达式之前被判定为无效则不计算，除数为0时不计算
 if (expressionLeft == "Abandoned" || expressionRight == "Abandoned" ||
  (x == 0 && method == 5) || (y == 0 && method == 4))
 {
  expression = "Abandoned";
  return -1;
 }
 int result = 0;
 switch (method)
 {
  case 0:
   {
    //加
    result = x + y;
    expression = string.Format("{0}+{1}",
     expressionLeft == "" ? x.ToString() : expressionLeft,
     expressionRight == "" ? y.ToString() : expressionRight);
   }
   break;
  case 1:
   {
    //减
    result = x - y;
    expression = string.Format("{0}-{1}",
     expressionLeft == "" ? x.ToString() : expressionLeft,
     expressionRight == "" ? y.ToString() : expressionRight);
   }
   break;
  case 2:
   {
    //被减
    result = y - x;
    expression = string.Format("{1}-{0}",
     expressionLeft == "" ? x.ToString() : expressionLeft,
     expressionRight == "" ? y.ToString() : expressionRight);
   }
   break;
  case 3:
   {
    //乘以
    result = x * y;
    expression = string.Format("({0})*({1})",
     expressionLeft == "" ? x.ToString() : expressionLeft,
     expressionRight == "" ? y.ToString() : expressionRight);
   }
   break;
  case 4:
   {
    //除以
    if (x % y == 0)
    {
     result = x / y;
     expression = string.Format("({0})/({1})",
      expressionLeft == "" ? x.ToString() : expressionLeft,
      expressionRight == "" ? y.ToString() : expressionRight);
    }
    else
    {
     expression = "Abandoned";
    }
   }
   break;
  case 5:
   {
    //除
    if (y % x == 0)
    {
     result = y / x;
     expression = string.Format("({1})/({0})",
      expressionLeft == "" ? x.ToString() : expressionLeft,
      expressionRight == "" ? y.ToString() : expressionRight);
    }
    else
    {
     expression = "Abandoned";
    }
   }
   break;
 }
 //运算不合法，则返回-1，表达式为Abandoned，
 if (expression == "Abandoned")
 {
  return -1;
 }
 return result;
}

3. Main函数调用

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
static void Main(string[] args)
{
 string s = "";
 bool try24;
 try24 = Try24(1, 2, 3, 4, ref s); Console.WriteLine("1,2,3,4: " + s);
 try24 = Try24(1, 3, 5, 7, ref s); Console.WriteLine("1,3,5,7: " + s);
 try24 = Try24(2, 3, 6, 4, ref s); Console.WriteLine("2,3,6,4: " + s);
 try24 = Try24(5, 7, 9, 4, ref s); Console.WriteLine("5,7,9,4: " + s);
 try24 = Try24(6, 3, 4, 5, ref s); Console.WriteLine("6,3,4,5: " + s);
 try24 = Try24(9, 5, 2, 7, ref s); Console.WriteLine("9,5,2,7: " + s);
 try24 = Try24(4, 9, 8, 3, ref s); Console.WriteLine("4,9,8,3: " + s);
 try24 = Try24(4, 9, 8, 2, ref s); Console.WriteLine("4,9,8,2: " + s);
 try24 = Try24(10, 10, 10, 10, ref s); Console.WriteLine("10,10,10,10: " + s);
 Console.ReadLine();
}

4. 程序运行结果：

C#实现的24点游戏实例详解

希望本文所述对大家的C#程序设计有所帮助。