Basic HTML version of Foils prepared April 16,1996

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

From Perl5 and Advanced Perl4 Features Computational Science for Information Age Course CPS616 Material -- April 16,1996. by Geoffrey C. Fox
1 sub doublearray {
  • my(*arraypointer) = @_;
  • foreach $elem (@arraypointer) {
    • $elem *= 2;
  • }
2 } # End routine to double elements of any array
3 # Suppose @foo and @bar are arrays
4 doublearray(*foo); # doubles elements of @foo
5 doublearray(*bar); # doubles elements of @bar
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