关于JANA的课程设计，简单的计算器是一种能实现加、减、乘、除、开方、求倒数等简单运算的工具。要实现计算功能，可以用JAVA的知识编写程序来解决此问题。-About JANA curriculum design, a simple calculator to achieve an add, subtract, multiply, divide, square root, and seek the countdown and other simple computing tools. To achieve the computing power, you can use knowledge of JAVA programming to solve this problem.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001666s ]
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:0.095525s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000942s ]
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SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001048s ]
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