printf takes a FORMAT: in this case, that's "%d: %s, %s\n". Those FORMATs are documented under the related function sprintf.

The 'for @sorted' part is a statement modifier: documented under perlsyn: Statement Modifiers.

Hopefully, the remaining parts are clear. If not, please specify what part(s) you're having difficulty with.

— Ken

In reply to Re^3: sorting hash alphabetically with numbering by kcott
in thread sorting hash alphabetically with numbering by reebee3

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