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34 lines
831 B
HTML
34 lines
831 B
HTML
<h1>数学函数 - sin</h1>
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<p>原型：extern float sin(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）的正弦值。</p>
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<p>说明：x的值域为[-1.0，1.0]。</p>
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举例：<pre>
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// sin.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/2; // M_PI=PI=3.14159265..., defined in math.h
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printf("sin(PI/2)=%f",sin(x));
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getchar();
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return 0;
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}
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</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="cos.html">cos</a>,<a href="tan.html">tan</a>
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