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Re: Multichar tokens

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From	Nigel Wade <nmw@local.domain>
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Subject	Re: Multichar tokens
Date	Mon, 15 Aug 2016 10:17:29 +0100
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On 13/08/16 23:05, Stefan Ram wrote:
> In Java, »- -2« must be written as »- -2« and not as »--2«,
>    because there also is a special »--« operator. S

Surely there is no ambiguity, --2 would be an illegal operation since you cannot decrement a constant.

The Java lang. specification says:
"The result of the unary [++/--]expression must be a variable of a type that is convertible (§5.1.8) to a numeric type, or a compile-time error occurs."

Since 2 is not a variable it's a compile-time error:

Test.java:6: error: ';' expected
           i = i --2;
                   ^
Test.java:7: error: ';' expected
           i--2;
              ^
2 errors

Neither format of --2 is allowed. Are there any others?

If you are worried about any potential ambiguity, remove it with parentheses.
-(-2) has no ambiguity, and no reason to be misinterpreted.

class Test {
   public static void main(String[] args) {
     int i = 3;
     i = i -(-2);
     System.out.println(i);
   }

$ javac Test.java
$ java Test
5

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Re: Multichar tokens Nigel Wade <nmw@local.domain> - 2016-08-15 10:17 +0100

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