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34 lines
890 B
HTML
34 lines
890 B
HTML
<h1>数学函数 - tan</h1>
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<p>原型：extern float tan(float x);</p>
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<p>用法：#include <math.h></p>
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<p>功能：计算x（弧度表示）的正切值。</p>
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<p>说明：返回x的正切值。</p>
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举例：<pre><code class="language-c">
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// tan.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=M_PI/4; // M_PI=PI=3.14159265..., defined in math.h
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printf("tan(PI/4)=%f",tan(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="cos.html">cos</a>
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