Basic HTML version of Foils prepared Sept 20 97

Foil 27 Some Remarks about Subroutines - IV -- Call by Reference

From Perl5 and Advanced Perl4 Features Computational Science for Information Age Course CPS616 -- Sept 20 97. by Geoffrey C. Fox,Nancy McCracken,Tom Scavo
1 sub doublearray {
2 my(*arraypointer) = @_;
3 foreach $elem (@arraypointer) {
  • $elem *= 2;
4 }
5 } # End routine to double elements of an array
6 # Suppose @foo and @bar are arrays:
7 doublearray(*foo); # doubles elements of @foo
8 doublearray(*bar); # doubles elements of @bar
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