采用编译原理的LL(1)文法判断一个算术表达式是否正确如 113+23*3.4*（32.4-5）/23并且给出详细的栈过程显示-The principle used to compile the LL (1) grammar to determine whether or not a correct arithmetic expression such as 113+23* 3.4* (32.4-5)/23 and gives a detailed process shows that the stack