Author: Robert Hyatt
Date: 15:28:56 01/08/03
Go up one level in this thread
On January 08, 2003 at 16:01:34, Dieter Buerssner wrote: >On January 08, 2003 at 15:45:27, Robert Hyatt wrote: > >>On January 07, 2003 at 09:16:21, Uri Blass wrote: >> >>>2)I get a lot of remarks for movei and the most popular remark is >>> >>>external definition with no prior declaration >>> >>>Do I need to declare function before I use it. >> >>Yes you must. > >Hmmm - I don't see this. Can you cite a part of the C Standard, that shows, that >you really "must"? Yes. The part that says "if a function is not declared before it is used, the assumptions are ..." :) By the same token, You should always use signed or unsigned when declaring chars since the standard leaves that an open issue as well... > >>>5)operands are evaluated in unspecified order >>> >>>It is not my fault that the intel compiler does not know that the order of >>>adding is not important because it does not know that calculating one expression >>>does not change the second expression. >>> >>>Uri >> >>The order _is_ specific. That usually means you are mixing operators of >>difference >>precedence without using () to specify your chosen order of evaluation. Just >>add >>the parens to avoid some _ugly_ errors... > >The order, in which different terms are evaluated in aritmetic expressions is >typically _not_ specific in C. Mixing operators of _different_ precedence >without () is no problem at all. Normally, one would not want to write > >w = ((x*y) + z); Sure... but what about the bitboard stuff that includes a>>n+1 That can wreck a program silently and hideously... Depending on what you mean... > >instead of > >w = x*y + z; > >which is guaranteed to mean the same thing in C. > >Regards, >Dieter You missed the point. That means that someone _knows_ what is going on. :) IE w = z + x*y; I know how that works. but a beginner might not. And by using parens he avoids a whole lot of problems. For the bitwise operators and a lot of others I don't even try to remember which is done first, I just use parens.
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