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关于php开平方问题

WBOY
Release： 2016-06-06 20:00:31
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这个算法还搞不定。LuciferStar给我参考的...怕自己忘了，先写出来。 －－－－－－－－－－－ sqrt (PHP 3, PHP 4 ) sqrt -- 平方根 说明 float sqrt ( float arg) 返回 arg 的平方根。 ?php // Precision depends on your precision directive echo sqrt(9)

这个算法还搞不定。LuciferStar给我参考的...怕自己忘了，先写出来。

－－－－－－－－－－－

sqrt
(PHP 3, PHP 4 )

sqrt -- 平方根
说明
float sqrt ( float arg)


返回 arg 的平方根。

 

// Precision depends on your precision directive
echo sqrt(9); // 3
echo sqrt(10); // 3.16227766 ...
?>
 

 

参见 pow()。  

－－－－－－－－－－－－

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