uTools-Manuals/docs/c/sin.html
2019-04-08 23:22:26 +08:00

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<h1>数学函数 - sin</h1>
<p>原型extern float sin(float x);</p>
<p>用法:#include &lt;math.h></p>
<p>功能计算x弧度表示的正弦值。</p>
<p>说明x的值域为[-1.01.0]。</p>
举例:<pre>
// sin.c
#include &lt;syslib.h>
#include &lt;math.h>
main()
{
float x;
clrscr(); // clear screen
textmode(0x00); // 6 lines per LCD screen
x=M_PI/2; // M_PI=PI=3.14159265..., defined in math.h
printf("sin(PI/2)=%f",sin(x));
getchar();
return 0;
}
</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>