Basic HTML version of Foils prepared Sept 20 97

Foil 52 Functions and Subroutines I

From Tutorial on PERL Computational Science for Information Age Course CPS616 -- Sept 20 97. by Geoffrey C. Fox,Nancy McCracken,Tom Scavo
Functions are defined by the sub construct
  • sub subname {
    • statements;
    • expression defining returned result;
  • }
They are invoked as follows:
  • $sum = add(); # a simple routine with no args
  • sub add {
    • $a1+$a2+$a3; # Sum three global vars
  • }
You can also use the older syntax:
  • $sum = &add;

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