Files
uTools-Manuals/docs/c/sin.html
T
fofolee 38dcd51d8a v0.0.2
2019-04-21 11:50:48 +08:00

34 lines
896 B
HTML
Raw Blame History

This file contains ambiguous Unicode characters
This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.
<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><code class="language-c">
// 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;
}
</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="cos.html">cos</a>,<a href="tan.html">tan</a>