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Topic: ++ (Read 627 times) |
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js
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++
« on: May 18th, 2004, 12:57pm » |
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I'm a fan of compact code à la C++, which means that I often use the ++ (increment) command. However there seems to be a bug for this command, either in the reference or in Processing itself. If I look at the example from the reference pages:
int a = 0; // Sets "a" to 0
int b = a++; // Sets "b" to 1
int c = b++; // Sets "c" to 2
it doesn't make sense in the typical (C++) definition, where the incrementation is done after each other command on the same line. This is also what happens when running the code - "a" will be 1 - "b" will be 1 - and "c" will be 0.
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TomC
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Re: ++
« Reply #1 on: May 18th, 2004, 1:43pm » |
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Pretty sure that's a bug in the reference.
I read foo++ as "use foo and then increment foo", and ++foo as "increment foo and then use foo".
C++ and Java should be the same in this respect.
As I understand it, that code would work with the prefix increment (++a, and ++b). So I guess the reference should either be...
Code:
int a = 0; // Sets "a" to 0
int b = a++; // Sets "b" to 0, then "a" to 1
int c = b++; // Sets "c" to 0, then "b" to 1
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or:
Code:
int a = 0; // Sets "a" to 0
int b = ++a; // Sets "a" to 1, then "b" to 1
int c = ++b; // Sets "b" to 2, then "c" to 2
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or:
Code:
int a = 0; // Sets "a" to 0
int b = ++a; // Sets "a" to 1, then "b" to 1
int c = b++; // Sets "c" to 1, then "b" to 2
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Hope I got those right!
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fry
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Re: ++
« Reply #2 on: May 18th, 2004, 2:33pm » |
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yep, those are right, and it would just be a typo in the reference. java/c++ are identical on these points.
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REAS
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Re: ++
« Reply #3 on: May 18th, 2004, 9:56pm » |
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Yes, an error in the reference. I'm adding it to my reference corrections list.
+ Casey
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REAS
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Re: ++
« Reply #4 on: Jun 12th, 2004, 10:17am » |
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OK. The reference has been updated for both increment and decrement. Please check it out.
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