实现一个关于表达式的LR语法分析程序 识别用户输入的包含变量与整数的混合算术表达式（不包含减法与除法运算）
文法如下：
0 S E
1 E E+E
2 E E E
3 E E
4 E i
编程运用上述LR分析表 识别从键盘输入的算术表达式 ">实现一个关于表达式的LR语法分析程序 识别用户输入的包含变量与整数的混合算术表达式（不包含减法与除法运算）
文法如下：
0 S E
1 E E+E
2 E E E
3 E E
4 E i
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001099s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.087887s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000905s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001139s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000988s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003027s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000804s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003807s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015015s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001003s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 40080 [ RunTime:0.018784s ]
