是硬件的BUG吧：）

05-4-13，albertlee <hanzhupeng at 163.com> 写道：
> 
> 俄，找到原因了，是浮点数的表示
> 
> 1.255 在内存中是 1.2549999999999999
> 
> 不知道这个问题，算不算是个bug
> 
> ======= 2005-04-13 22:09:35 您在来信中写道：=======
> 
> >>>> round(1.25,1)
> >1.3
> >>>> round(1.255,2)
> >1.25
> >~~~~~~~~~~~ 为什么不是期望中的 1.26 ?
> >
> >我找了源代码中的实现：
> >
> >static PyObject *
> >builtin_round(PyObject *self, PyObject *args)
> >{
> > double x;
> > double f;
> > int ndigits = 0;
> > int i;
> >
> > if (!PyArg_ParseTuple(args, "d|i:round", &x;, &ndigits;))
> > return NULL;
> > f = 1.0;
> > i = abs(ndigits);
> > while (--i >= 0)
> > f = f*10.0;
> > if (ndigits < 0)
> > x /= f;
> > else
> > x *= f;
> > if (x >= 0.0)
> > x = floor(x + 0.5);
> > else
> > x = ceil(x - 0.5);
> > if (ndigits < 0)
> > x *= f;
> > else
> > x /= f;
> > return PyFloat_FromDouble(x);
> >}
> >
> >感觉没有问题阿？
> >
> >
> >
> >
> >致
> >礼！
> >
> >
> >albertlee
> >hanzhupeng at 163.com
> >2005-04-13
> >_______________________________________________
> >python-chinese list
> >python-chinese at lists.python.cn
> >http://python.cn/mailman/listinfo/python-chinese
> >
> 
> = = = = = = = = = = = = = = = = = = = =
> 
> 
> 致
> 礼！
> 
> albertlee
> hanzhupeng at 163.com
> 2005-04-13
> 
> 
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> 
> 
> 


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