Re: Difference between Perl and Java for << operator?

by LanX (Saint)

on Jul 29, 2021 at 23:03 UTC ( [id://11135507]=note: print w/replies, xml )

Need Help??

Don't know much about Java, but

> I have this bit of Java code, which is known to work as-expected:

> RESULT: -268435456

How can a negative result be considered expected?

I think you should take care that both sides are unsigned integers of same size.

FWIW I don't get your Perl result

  DB<16> say $x= 0xFFFFFFFF << 28
1152921504338411520
[download]

so 64bit Perl seems to matter too.

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery}

Comment on Re: Difference between Perl and Java for << operator? Download Code

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Re^2: Difference between Perl and Java for << operator? by GrandFather (Saint) on Jul 30, 2021 at 04:00 UTC
It's an expected result if you assume signed 32 bit integer variables and your code is predicated on that assumption. Optimising for fewest key strokes only makes sense transmitting to Pluto or beyond	[reply]
Re^3: Difference between Perl and Java for << operator? by LanX (Saint) on Jul 30, 2021 at 08:28 UTC
as I said > > take care that both sides are unsigned integers of same size. Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply]
Re^4: Difference between Perl and Java for << operator? by NERDVANA (Deacon) on Jul 30, 2021 at 12:07 UTC
All integers are signed in Java. or at least they were a decade ago when I used it. It's one of the annoyances of the language.	[reply]

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