功能强大的计算器，采用仿C语言表达式语法 并且给出表达式的逆波兰表达式，支持二十余种函数运算，程序经测试成功-powerful calculator, using fake C language syntax expression and expression is the inverse Poland expression, I support 20 species of Operational functions, procedures have been tested successfully
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001969s ]
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:0.089843s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002339s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001926s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002395s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003666s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002077s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003229s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014921s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002458s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 296189 [ RunTime:0.001096s ]
