Re^10: converting binary to decimal

> Most probable reason you are seeing what you saw -> you did "use feature 'bitwise'" earlier in your debugging session. bitwise forces plain | to numeric.

There was no "use feature 'bitwise'" inside the debugger.

:~$ perl -de0

Loading DB routines from perl5db.pl version 1.77
...
  DB<1> say (0 . "$_" | 1 . "1") for qw/0 2 4 6 8/
11
11
15
15
11

  DB<2>
[download]

but the interactive debugger seems to automatically run under -E

E commandline
behaves just like -e, except that it implicitly enables all optional features and builtin functions (in the main compilation unit). See feature and builtin.

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

see Wikisyntax for the Monastery}

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Re^11: converting binary to decimal by tybalt89 (Monsignor) on Jun 08, 2025 at 14:21 UTC
Good catch! Quick test: if `say 1 \|. 2` does NOT give an error, you're running with use feature 'bitwise';	[reply] [d/l]
Re^12: converting binary to decimal by LanX (Saint) on Jun 08, 2025 at 16:05 UTC
These are the features automatically activated in the debugger `use feature 'current_sub', 'bitwise', 'evalbytes', 'fc', 'isa', 'p +ostderef_qq', 'say', 'signatures', 'state', 'unicode_strings', 'unico +de_eval';` [download] Tested for 5.036000. Cheers Rolf _{(addicted to the Perl Programming Language :) see Wikisyntax for the Monastery}	[reply] [d/l]
Re^11: converting binary to decimal by harangzsolt33 (Deacon) on Jun 08, 2025 at 15:32 UTC
Wait. Are you saying that if someone has "use feature 'bitwise' in their header, then this code fails? How do I make sure it doesnt? Can I write "no feature 'bitwise';" inside binary2decimal() to make sure it doesn't misbehave? Or is that unnecessary?	[reply]
Re^12: converting binary to decimal by LanX (Saint) on Jun 08, 2025 at 16:02 UTC
> Wait. Are you saying that if someone has "use feature `bitwise` in their header, then this code fails? If it's in the same scope, yes. Not sure what header means for you. > Can I write "no feature 'bitwise';" inside binary2decimal() to make sure it doesn't misbehave? Theoretically yes, try it out. Better use feature `bitwise` and change the operator to `\|.` ... But this wouldn't work in older Perl. So in case backwards compatibility is an issue, maybe `no` combined with `if` Version >... In general, if someone was copying that code into his scope, you shouldn't be bothered about their fate. It's their responsibility. The right approach of sharing code is to use modules, not boilerplating. Cheers Rolf _{(addicted to the Perl Programming Language :) see Wikisyntax for the Monastery}	[reply] [d/l] [select]


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