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2018-10-09-C语言中常用数学函数.html
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<p>C语言中常用Math函数。 <img src="http://www.dhu021.top/wp-content/uploads/2018/10/timg-300x168.jpg" alt=""></p>
<h3 id="第一步的操作是-include-lt-math-h-gt-1、fabs-double-x-对于double类型的x取绝对值。"><a href="#第一步的操作是-include-lt-math-h-gt-1、fabs-double-x-对于double类型的x取绝对值。" class="headerlink" title="第一步的操作是 #include <math.h> 1、fabs(double x) 对于double类型的x取绝对值。"></a>第一步的操作是 #include <math.h> 1、fabs(double x) 对于double类型的x取绝对值。</h3><p>2、floor(double x) ceil(double x) 对于double的x向下取整和向上取整，返回值为double型。<br>3、pow(double x,double p) 返回r的p次方。<br>4、sqrt(double x) 返回x的算术平方根。<br>5、log(double x) 返回x的以自然对数为底的对数。就是ln。<br>如果想求log以a为底b的对数，需要用到换底公式。就是拆成除法。 比如loga\b=log(a)/log(b)。<br>6、sin(double x)、cos(double x)、tan(double x) 这三个函数要求参数为弧度制。<br>举个栗子：<br><code>doubel db1 = sin(pi*45/180);</code>所以要搞清楚弧度换算。<br>7、<br>asin(double x)、<br>acos(double x)、<br>atan(double x) 反三角函数。<br>举个例子 <code>double db2 = asin(1);</code><br>8、round(double x) 将x四舍五入，返回值也是double型，需进行取整。<br>举个例子：<br><figure class="highlight lisp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">double db3 = round(<span class="number">3.40</span>)<span class="comment">; </span></span><br><span class="line">printf(<span class="string">"%d"</span>,(<span class="name">int</span>)db3)<span class="comment">;</span></span><br></pre></td></tr></table></figure></p>
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