用C语言来实现。二分法，简单迭代法矣牛顿迭代法这三种方法来求非线性的方程的根，比较这三种的收敛性。-C language. Dichotomy, a simple iterative method Yi Newton iteration of these three methods for nonlinear equations root, comparing the convergence of three.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001472s ]
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:0.119554s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002952s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002542s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002093s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.010009s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001228s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.009057s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.025602s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001510s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 302306 [ RunTime:0.055098s ]
