24點計算器
沒別的辦法，只有把各種可能都計算一遍，然後得到能計算出24的表示式，並且盡可能的排除掉重複的表示式
假設有a b c d四個數，操作符用op代替，則有(a op b) op (c op d) 或 ((a op b) op c) op d 兩種形式
程式用c# 2.0開發，支援計算 8 / (3 - 8 / 3) = 24 這種
這個程式最傷腦筋的地方就是如何去掉重複的結果，我自己改寫了gethashcode()方法，以盡可能的讓重複的表示式計算出相同的值出來
syntax:
calc24 [num1 [num2 [num3 [num4]]]]
example:
calc24 3 3 8 8
calc24 3 3 8
calc24 3 3
calc24 3
calc24
若省略引數，則程式自動隨機生成乙個24以內的數代替
code:
#define debug
using system;
using system.collections.generic;
using system.text;
using system.text.regularexpressions;
namespace calculate24
;#endif
string list = new string ;
int v1 = 0;
int v2 = 0;
int v3 = 0;
int v4 = 0;
int i = 0;
console.writeline("24 point calculator rn");
if (args.length > 0)
array.copy(args, list, math.min(args.length, list.length));
foreach (string item in list)
}string outstring = calculate.run(v1, v2, v3, v4);
if (!string.isnullorempty(outstring))
else
無論如何都無法計算得出 24rn", new object ));
}console.writeline("press any key to continue...");
console.readkey();
}private static random random = new random(environment.tickcount);
private static int tryparse(string value)}}
using system;
using system.collections.generic;
using system.text;
namespace calculate24
}if (v2 != v3)
foreach (value vl in listleft)
}if (v2 != v4)
foreach (value vl in listleft)
}buildvaluelist(listleft, listright, listresult, v1, v2, v3, v4);
buildvaluelist(listleft, listright, listresult, v1, v3, v2, v4);
buildvaluelist(listleft, listright, listresult, v1, v3, v4, v2);
buildvaluelist(listleft, listright, listresult, v1, v2, v4, v3);
buildvaluelist(listleft, listright, listresult, v1, v4, v2, v3);
buildvaluelist(listleft, listright, listresult, v1, v4, v3, v2);
buildvaluelist(listleft, listright, listresult, v2, v3, v1, v4);
buildvaluelist(listleft, listright, listresult, v2, v3, v4, v1);
buildvaluelist(listleft, listright, listresult, v2, v4, v1, v3);
buildvaluelist(listleft, listright, listresult, v2, v4, v3, v1);
buildvaluelist(listleft, listright, listresult, v3, v4, v1, v2);
buildvaluelist(listleft, listright, listresult, v3, v4, v2, v1);
return listresult.tostring();
}private static void buildvaluelist(valuelist listleft, valuelist listright, valuelist listresult,
double v1, double v2, double v3, double v4)
foreach (value vl in listright)
}private static void buildvaluelist(valuelist list, double v1, double v2)
else
if (v1 != v2)
else}}
private static void buildvaluelist(valuelist list, value v1, value v2)
else
if (v1.value != v2.value)
else}}
private static void buildvaluelist(valuelist list, value v1, double v2)
else
if (v1.value != v2)
else}}
}}using system;
using system.collections.generic;
using system.text;
namespace calculate24
public value(value v1, value v2, char op)
public value(value v1, double v2, char op)
public value(double v1, value v2, char op)
private void calculatevalue()
calculatehashcode();
}public override string tostring()
else
s1 = v1.tostring();
if (vv2 != null)
else
s2 = v2.tostring();
return string.format(" ", s1, op, s2);
}public override int gethashcode()
private int hashcode = 0;
private void calculatehashcode()
hashcode += buffer.length * 7;}}
}using system;
using system.collections.generic;
using system.text;
namespace calculate24
int hash = item.gethashcode();
foreach (value value in this)
add(item);}}
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