Passing parameters in and out of subroutines
Subroutines in Perl example from a Well House Consultants training course
More on Subroutines in Perl [link]
Source code: subgnrange Module: P209
$trainees = readrange("Students booked",0,10);
$duration = readrange("Days long",1,5);
print "A $duration day course with $trainees students\n";
print $duration*($trainees+1)," lunches\n";
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