The c-style for loop (for (a;b;c)) doesn't work as a statement modifier, only the for (@list) kind of for: 
$product *= $_ for 1..$number;

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(update: corrected per ikegami) where .. is used to produce a list.

See http://search.cpan.org/perldoc/perlsyn#Statement_Modifiers (noting that foreach and for are synonymous).

In reply to Re: back iffing with for? by ysth
in thread back iffing with for? by Anonymous Monk

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