uTools-Manuals/docs/c/log.html
2019-04-21 11:50:48 +08:00

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<h1>数学函数 - log</h1>
<p>原型extern float log(float x);</p>
<p>用法:#include &lt;math.h></p>
<p>功能计算x的自然对数。</p>
<p>说明x的值应大于零。</p>
举例:<pre><code class="language-c">
// log.c
#include &lt;syslib.h>
#include &lt;math.h>
main()
{
float x;
clrscr(); // clear screen
textmode(0x00); // 6 lines per LCD screen
printf("ln(e)=%f\n", log(M_E)); // M_E is 2.71828..., defined in math.h
getchar();
return 0;
}
</code></pre>相关函数:<a href="log10.html">log10</a>