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33 lines
706 B
HTML
33 lines
706 B
HTML
<h1>数学函数 - log</h1>
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<p>原型：extern float log(float x);</p>
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<p>用法：#include <math.h></p>
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<p>功能：计算x的自然对数。</p>
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<p>说明：x的值应大于零。</p>
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举例：<pre><code class="language-c">
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// log.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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printf("ln(e)=%f\n", log(M_E)); // M_E is 2.71828..., defined in math.h
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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="log10.html">log10</a>
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