词法分析,里面有一个bug,\")\"后面不能跟其他符号,但是这个更像是自己作的,程序很简单,我自己做了大修改,加了很多注释-lexical analysis, which has a bug, ")" not behind other symbols, But this is more like myself, is very simple procedure, I did a lot of changes with a number of Notes