21 Mar
2013
21 Mar
'13
12:39 a.m.
在 2013-03-20三的 08:24 -0600，Eric Blake写道：
On 03/20/2013 12:06 AM, li guang wrote:
- return snprintf(dest, len, "%0.03f%c", (double)*ptr/div, suffixes[i]);
^^^^^^ ^^^^^^^^^^^^^^^+}
IMHO, you may need (double)(*ptr/div), for type cast is right associated.
No, the code as written is correct, and your proposal would be wrong. As written, it is evaluated as:
((double)*ptr) / div
which promotes the division to floating point. Your proposal would do the division (*ptr/div) as an integral (truncating) division, and only then cast the result to double.
Yes, you're right, amazing c type cast!