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Thread: Abbreviated Arithmetic
 10102010, 09:08 AM #1Member
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Abbreviated Arithmetic
Hello,
I'm very new to Java, and I'm actually taking an intro course so hopefully my questions isn't silly. :) One of the questions we are asked is why is abbreviated arithmetic important to java and how it's used effectively. I've done several google searches to research this but haven't come up with anything. Can someone explain it to me or give me some good resources to read about it, please?
 10102010, 01:37 PM #2abbreviated arithmetic
How does that relate to the arithmetic operators: +*/%
 10102010, 08:55 PM #3Member
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Well, from our notes, they discuss two types of abbreviated arithmetic within two categories of augments  increments and decrements.
So it looks like it is talking about things like c+=a; instead of c = c + a; or ++c; instead of c = c+1;
Honestly, when I reviewed the notes, I was actually wondering why we use the abbreviations like this and what makes using these easier than writing c = c + a;
Any help would be very much appreciated. Thanks for responding so fast!
 10102010, 09:00 PM #4why is abbreviated arithmetic important to java
The prefix and postfix notations are useful, but again can be confusing.
 10102010, 09:07 PM #5Member
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It's more of a discussion question that I have to answer. I've tried googling it with different wording, but it doesn't seem like there is anything discussing what makes abbreviated arithemetic important.

Many feel that abbreviated arithmetic is little more than syntactic sugar, and per Alan Perlis, "syntactic sugar causes cancer of the semicolon".
 10102010, 09:34 PM #7

 10102010, 10:16 PM #9
 10102010, 10:22 PM #10Member
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LOL. So what you all are saying is that abbreviated arithemetic really isn't all that important?
Oh this will totally make the discussion question harder to answer. I'll have to look up syntactic sugar and read about that one. LOL
 10112010, 04:09 AM #11Member
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Don't forget c *= 2 amd c /= 2 :D.
I love increments, it makes for loops easier to write....
 10112010, 07:11 AM #12
You missed c &= 2; c = 2; and c ^= 2;
Hmm, are there any more?
db
 10112010, 08:06 PM #13
All that remains is the remainder: %=.
So we have a list then: ++ (pre/post),  (pre/post), +=, =, *=, /=, &=, =, ^=, %=.
 10112010, 08:12 PM #14
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Part of the 'fun' is that the left hand operand isn't evaluated and not prone to widening conversions; let b be of type byte and do this: 'b+= 3' versus 'b= b+3'. In e.g. C more fun can be shown ;)
kind regards,
Jos
 10112010, 08:13 PM #15
In those cases (which are rarer than just a basic "int x = 5; x += 2;" type thing), the programmer should make it explicit which types are being used and how they're being added. ;)
 10112010, 08:29 PM #16
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 10112010, 08:31 PM #17
I totally agree that abbreviated arithmetic should be used (only 'cause I'm lazy but that's beside the point); however when conversions are involved in a convoluted way (such as with bytes and ints being mixed), there should be some kind of explicit conversion rather than just hoping that it converts correctly.
 10122010, 11:27 AM #18
If I had to write an answer to this question, I'd probably just say that abbreviated arithmetic eliminates redundancy in the code.
Sincerely, Joshua Green
Please REP if I help :)
 10122010, 10:52 PM #19Member
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Thanks for all the responses. You guys are awesome!
 10132010, 12:46 AM #20Member
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