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<h1>数学函数 - atan</h1>
<p>原型：extern float atan(float x);</p>
<p>用法：#include &lt;math.h></p>
<p>功能：求x（弧度表示）的反正切值</p>
<p>说明：值域为(-π/2，+π/2)。</p>
举例：<pre><code class="language-c">
// atan.c
#include &lt;syslib.h>
#include &lt;math.h>
main()
{
float x;
clrscr(); // clear screen
textmode(0x00); // 6 lines per LCD screen
x=0.32;
printf("atan(%.2f)=%.4f",x,atan(x));
getchar();
return 0;
}
</code></pre>相关函数：<a href="asin.html">asin</a>,<a href="acos.html">acos</a>,<a href="atan2.html">atan2</a>,<a href="sin.html">sin</a>,<a href="cos.html">cos</a>,<a href="tan.html">tan</a>
<h1>数学函数 - atan</h1>
<p>原型：extern float atan(float x);</p>
<p>用法：#include &lt;math.h></p>
<p>功能：求x（弧度表示）的反正切值</p>
<p>说明：值域为(-π/2，+π/2)。</p>
举例：<pre><code class="language-c">
// atan.c
#include &lt;syslib.h>
#include &lt;math.h>
main()
{
float x;
clrscr(); // clear screen
textmode(0x00); // 6 lines per LCD screen
x=0.32;
printf("atan(%.2f)=%.4f",x,atan(x));
getchar();
return 0;
}
</code></pre>相关函数：<a href="asin.html">asin</a>,<a href="acos.html">acos</a>,<a href="atan2.html">atan2</a>,<a href="sin.html">sin</a>,<a href="cos.html">cos</a>,<a href="tan.html">tan</a>