Re^4: bignum and parenthesis

what does the parser think the modulo and number is doing there?

It thinks you made a weird coding choice, which is why perl will warn you about it, if you let it:

C:\> perl -Mbignum -le  "use warnings; use strict; print ( 7 ** 127 ) 
+% ( 524287 )"
print (...) interpreted as function at -e line 1.
Useless use of modulus (%) in void context at -e line 1.
2125450924568016708443303831058962243331938167363998499854997578694839
+02203328714236393937418376186556719543
[download]

Yet another reason to always use warnings; use strict; or equivalent.

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Re^5: bignum and parenthesis by kcott (Archbishop) on Jul 08, 2023 at 08:05 UTC
++ I'm a little late to the party on this one: I've been tied up with other things over the last few days. I was going to mention `warnings` but, as I see you've already done this, here's some additional information for the AM. You're using `v5.36.1`. If you specify `use v5.36` you'll automatically get `strict` and `warnings`. `$ perl -e 'use warnings; print (7 + 1)' print (...) interpreted as function at -e line 1. 8 $ perl -e 'use v5.36; print (7 + 1)' print (...) interpreted as function at -e line 1. 8 $ perl -e 'use v5.36; print +(7 + 1)' 8` [download] [See "perl5360delta: use v5.36" for other things you'll get automatically.] See in perldiag, "%s (...) interpreted as function". You can get that warning with many functions, not just `print`. See in perlop, "Symbolic Unary Operators" (penultimate paragraph) 'Unary `"+"` ... It is useful syntactically for separating a function name from a parenthesized expression* that would otherwise be interpreted as the complete list of function arguments. ...'* [my emphasis] — Ken	[reply] [d/l] [select]

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Re^5: bignum and parenthesis
by kcott (Archbishop) on Jul 08, 2023 at 08:05 UTC

++ I'm a little late to the party on this one: I've been tied up with other things over the last few days. I was going to mention warnings but, as I see you've already done this, here's some additional information for the AM.

You're using v5.36.1. If you specify use v5.36 you'll automatically get strict and warnings.

$ perl -e 'use warnings; print (7 + 1)'
print (...) interpreted as function at -e line 1.
8

$ perl -e 'use v5.36; print (7 + 1)'
print (...) interpreted as function at -e line 1.
8

$ perl -e 'use v5.36; print +(7 + 1)'
8
[download]

[See "perl5360delta: use v5.36" for other things you'll get automatically.]

See in perldiag, "%s (...) interpreted as function". You can get that warning with many functions, not just print.

See in perlop, "Symbolic Unary Operators" (penultimate paragraph)

'Unary "+" ... It is useful syntactically for separating a function name from a parenthesized expression that would otherwise be interpreted as the complete list of function arguments. ...' [my emphasis]

— Ken

[reply]
[d/l]
[select]