Author: David Rasmussen
Date: 06:33:30 12/28/01
Go up one level in this thread
On December 27, 2001 at 16:56:21, Michel Langeveld wrote:
>
>Although I think the problem you posted before is already solved I still answer
>your question. It's good to write:
>
>int i;
>
>for (i=0; i < 8; i++)
>{
> /* i = 0,1,2,3,4,5,6,7 here */
>}
>
>/* i = 8 here */
>
>But you have to consider that if you use this construction that after this for
>i=8 in the end.
I'm not sure what you're saying here, but as for good style, this is recommended
(in C++ notation):
for (int i = 0; i != 8; ++i)
{
...
}
There are several points here:
1. The variable is declared close to where it is used. Enhances readability and
maintainability. Can't be done in C though.
2. The increment is written "++i" to emphasize that it is an incrementation and
nothing else. You only write it for it's side effect, you dont use the value of
the expression.
3. Most importantly to this discussion: The continuation condition "i != 8" is
more clear, since the invariant that holds after the loop (the post condition)
will always by definition be !(i != 8) which is i == 8. If you had "i < 8", your
post condition is !(i < 8) which is i >= 8. So you dont really know that i == 8
when you're done. If you do something to i in the loop (maybe as a bug), i == 8
might not be true at the end.
/David
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