用算符优先文法制作的算符优先分析器，实现了FIRSTVT跟LASTVT的输出跟优先表的输出以及栈的输出以及到文件的输出。-priority grammar operator with the operator priority to the production analyzer, achieved with LASTVT FIRSTVT output with the output of the priority list and stack output and the output of

以字符序列的形式从终端输入语法正确的、不含变量的整数表达式，利用给定的算符优先关系，实现对算术四则混合运算表达式的求值，并演示在求值过程中运算符栈、操作数栈、操作数栈和主要操作的变化过程。-In the form of a sequence of characters entered from the terminal grammatically correct, non-integer variable expressions using the operators given priorit