This an expression used to generate value for the procedures it can be imported...

代码说明：

这是一个用来生成表达工的值的程序 它可以输入8进制或十进制的数 建立一棵语法树 并返回表达式的值-This an expression used to generate value for the procedures it can be imported or 8 band of a few decimal establish a syntax tree and return to the value of the expression