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			控制台应用程序：Calculater 项目说明
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  本控制台应用程序，支持常见的20种数学函数运算，另外支持（（））嵌套运算：分别如下：
  "SIN","COS","TAN","ARCSIN","ARCCOS","ARCTAN","SINH","COSH","TANH","LOG10","LN",
  "EXP","FACT","SQRT","CUBEROOT","LOG","POW","MOD","YROOT","AVG","SUM","VAR","VARP",
  "STDEV","STDEVP"
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			      测试用例如下：
			   (1+(1/1)）*(1*1)=2
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  编译环境，vs2012，vc++控制台应用程序，直接fork，即可获取源代码
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  思想：通过语义检测函数名称，分割表达式，用数据结构去封装，两个栈，一个用来表示函数
  之间的嵌套结构，一个用来计算运算表达式。