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37 lines
847 B
HTML
37 lines
847 B
HTML
<h1>数学函数 - ceil</h1>
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<p>原型：extern float ceil(float x);</p>
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<p>用法：#include <math.h></p>
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<p>功能：求不小于x的最小整数</p>
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<p>说明：返回x的上限，如74.12的上限为75，-74.12的上限为-74。返回值为float类型。</p>
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举例：<pre><code class="language-c">
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// ceil.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=74.12;
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printf("ceil(%.2f)=%.0f\n",x,ceil(x));
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x=-74.12;
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printf("ceil(%.2f)=%.0f\n",x,ceil(x));
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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="floor.html">floor</a>
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