通过对键盘的编程，实验对键值的读取，实现计算器的功能，并将结果在数码管上显示。-Programming through the keyboard, the key test of reading, realize the functions of the calculator and the results in the digital tube display.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002040s ]
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SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002656s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002465s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003598s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001929s ]
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SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014236s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002256s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 314247 [ RunTime:0.001114s ]
