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35 lines
861 B
HTML
35 lines
861 B
HTML
<h1>数学函数 - cos</h1>
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<p>原型：extern float cos(float x);</p>
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<p>用法：#include <math.h></p>
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<p>功能：求x（弧度表示）的余弦值</p>
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<p>说明：返回值在[-1.0，1.0]之间。</p>
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举例：<pre><code class="language-c">
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// cos.c
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#include <syslib.h>
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#include <math.h>
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main()
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{
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float x;
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clrscr(); // clear screen
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textmode(0x00); // 6 lines per LCD screen
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x=PI/4.;
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printf("cos(%.4f)=%.4f\n",x,cos(x));
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getchar();
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return 0;
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}
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</code></pre>相关函数：<a href="asin.html">asin</a>,<a href="acos.html">acos</a>,<a href="atan.html">atan</a>,<a href="atan2.html">atan2</a>,<a href="sin.html">sin</a>,<a href="tan.html">tan</a>
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