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NNTP-Posting-Date: Wed, 11 May 2011 07:24:55 -0500
Date: Wed, 11 May 2011 05:24:48 -0700
From: Patricia Shanahan <pats@acm.org>
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Subject: Re: Java puzzler
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On 5/11/2011 1:44 AM, Gábor Bakos wrote:
> It worked as specified. I just found unexpected that there is an implicit cast to the type of the variable.
> For example there are not compiling:
> int x = 0.5;
> int y = 0;
> y = y + 0.5;
> These are no strange for me.
> Although the thing that
> int x = 0;
> x += .5;
> compiles without an error or warning it was unexpected for me. I do not see the usecase for the implicit cast there. (BTW the result I got was the correct 0 .)
> Maybe it is just me who finds this strange.

Without the implicit cast to the left hand side type, "+=" could not
have been used for byte, char, or short. The arithmetic operation
promotes to int, and there would be no way to cast back to the target type.

If the assignment and the arithmetic are done by separate operators, the
right hand side of the assignment can be explicitly cast to the left
hand side type if that is what is meant.

Patricia