（1）程序功能简介 实现计算器的功能。用户根据程序提示，输入数字，选择要进行的运算，可以进行加、减、乘、除、平方、求模、求方根等运算。 （2）程序设计说明 ① 针对加、减、乘、除、平方、求模、求方根操作，每种操作设计一个函数实现相应功能； ② 设计一个函数，可以对多个实数进行四则混合运算； ③ 设计main()测试函数
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001201s ]
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:0.097002s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001113s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001880s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001223s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003570s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001031s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003201s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015884s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001529s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 333508 [ RunTime:0.001482s ]
