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lonelyplanet999
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 Posted: Wed Mar 03, 2004 4:10 am Post subject: Operators available to byte, short, char types variables |
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Hi,
I would like to ask will <<, >>, >>>, ^, ~ operators be applicable to
above mentioned primitives ? So far I couldn't write code to apply
above operators to mentioned primitive types variables.
:)
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Johann Weber
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| Posted: Wed Mar 03, 2004 10:00 am Post subject: Re: Operators available to byte, short, char types variables |
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lonelyplanet999 wrote:
| Quote: | Hi,
I would like to ask will <<, >>, >>>, ^, ~ operators be applicable to
above mentioned primitives ? So far I couldn't write code to apply
above operators to mentioned primitive types variables.
:)
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"The type of each of the operands of a shift operator must be a
primitive integral type, or a compile-time error occurs."
"The type of the operand expression of the unary ~ operator must be a
primitive integral type, or a compile-time error occurs"
And of course also the bitwise exclusive or operator ^ is applicable to
all primitive integer types.
I think your problem in your previous post was that you did not cast the
result properly befor assigning it.
Hans
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Tor Iver Wilhelmsen
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| Posted: Wed Mar 03, 2004 5:28 pm Post subject: Re: Operators available to byte, short, char types variables |
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[email]lonelyplanet999 (AT) my-deja (DOT) com[/email] (lonelyplanet999) writes:
| Quote: | I would like to ask will <<, >>, >>>, ^, ~ operators be applicable to
above mentioned primitives ?
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Yes, but they will be promoted to int. Use masking and casting to get
back to the smaller types (e.g. short s = (short) ((someShort << 3) &&
0xffff)).
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Jon A. Cruz
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| Posted: Thu Mar 04, 2004 5:29 am Post subject: Re: Operators available to byte, short, char types variables |
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Tor Iver Wilhelmsen wrote:
| Quote: | Yes, but they will be promoted to int. Use masking and casting to get
back to the smaller types (e.g. short s = (short) ((someShort << 3) &&
0xffff)).
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Oops. You made a little mistake there and used the wrong operator.
For bitwise operations, you need only a single ampersand:
short s = (short) ((someShort << 3) & 0xffff))
------------------------------------^
Oh, and there's a little trick I like to use to make the code a little
more readable:
short s = (short) ((someShort << 3) & 0x0ffff))
That leading '0' often clues in readers that there is no sign extension
going on. I use it mainly with bytes, though, and 0x0ff;
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