numbers - "Nearly divisible"

Question

我想检查一个浮点值是否“接近”32 的倍数。例如64.1“几乎”可以被 32 整除，63.9 也是如此。

现在我正在这样做:

#define NEARLY_DIVISIBLE 0.1f
float offset = fmodf( val, 32.0f ) ;
if( offset < NEARLY_DIVISIBLE )
{
    // its near from above
}
// if it was 63.9, then the remainder would be large, so add some then and check again
else if( fmodf( val + 2*NEARLY_DIVISIBLE, 32.0f ) < NEARLY_DIVISIBLE )
{
    // its near from below
}

有更好的方法来做到这一点吗？

Answer 1

好吧，您可以通过再减去 32 次来删除第二个 fmodf 以从下面获得 mod。

  if( offset < NEARLY_DIVISIBLE )
   {
       // it's near from above
   }
   else if( offset-32.0f>-1*NEARLY_DIVISIBLE)
   {
       // it's near from below
   }