On 5/19/06, Levi Pearson <[EMAIL PROTECTED]> wrote:
I wrote a little test program, and your typecasting issue is not an
issue, and the parentheses are not necessary. I haven't looked at
the spec to see what exactly causes the bytes to get promoted to
ints, but they do. It's probably the fact that a literal number is
interpreted as an int, not a byte, so byteval << intval causes the
byte to be promoted to an int. I ran into this by attempting to pass
literal numbers to a function that took two bytes, and having the
compiler complain that I was passing ints.
--Levi
In Java, all math operations (with non-static data) promote lesser
numbers to int values.
byte mathIsFun(byte a, byte b) {
return a + b; // ERROR!
}
Why is this an error? Because java automagically promotes the bytes
to ints and the result of the statement is an int -- the return value
is too small to hold the int that is produced by the addition. Java
does this to avoid common datatype under-runs. If you really did want
a byte, then just cast down:
return (byte) a + b; // No error.
-Bryan
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