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Examples of structure passing in Icon

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Here are some small programs that illustrate passing data structures to Icon procedures:

    procedure main()
      L  :=  [ 1, 2, 3 ];    # Set L to a list of 3 small integers
      Change_All ( L );      # This procedure does not affect L
      every write ( ! L );   # Display the values of L
      Change_One ( L );      # This procedure changes the first element of L
      every write ( ! L );   # Display the values of L
    procedure Change_All ( foo )  # This does not affect the caller's foo...
     foo  :=  86;                 # ...because we are not changing...
    end                           # ...a PART of an aggregate
    procedure Change_One ( foo )  # This procedure affects the caller's foo...
      foo[1]  :=  99;             # ...because we are changing...
    end                           # ...a PART of an aggregate

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John Shipman,
Last updated: 1996/01/06 21:12:57 UT
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