uTools-Manuals/docs/c/floor.html

<h1>数学函数 - floor</h1>


  <p>原型：extern float floor(float x);</p>
  
  <p>用法：#include &lt;math.h></p>
  
  <p>功能：求不大于x的最达整数</p>
  
  <p>说明：返回x的下限，如74.12的下限为74，-74.12的下限为-75。返回值为float类型。</p>
  
  举例：<pre>

      // floor.c
      
      #include &lt;syslib.h>
      #include &lt;math.h>

      main()
      {
        float x;
        
        clrscr();        // clear screen
        textmode(0x00);  // 6 lines per LCD screen
        
        x=74.12;
        printf("floor(%.2f)=%.0f\n",x,floor(x));
        x=-74.12;
        printf("floor(%.2f)=%.0f\n",x,floor(x));
        
        getchar();
        return 0;
      }
      
  </pre>相关函数：<a href="ceil.html">ceil</a>