On 12 June 2013, Dominique Pellé <[email protected]> wrote:
[...]
> You can half the number of comparisons when doing range checking.
> Instead of doing 2 comparisons...
>
> if (c >= '0' && c <= '9')
>
> You can do it in one comparison with this trick:
>
> if ((unsigned)c - '0' < 10)
[...]
Actually, the second version is a bit slower than the first. :) A
comparison is exactly as fast as a subtraction of the same length, and
(unsigned)c - '0' needs to store the result in memory.
/lcd
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