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Branching in Icon

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Here's a short program that illustrates conditional branches in Icon:

    procedure main()
      if  1 < 2  then
        write ( "One is less than two" )
        write ( "One is greater than two" );
The general form is ``if e1 then e2 else e3'', meaning ``if e1 produces at least one result, evaluate e2, otherwise evaluate e3.''

The less-than operator (e1<e2) means, ``if e1 is less than e2, produce the value of e2, otherwise produce no values at all.''

An Icon expression that produces no values is said to fail. This concept of failure is actually one of the cleanest and most useful features of Icon, in the author's opinion.

Next: The joys of failure in Icon
See also: A tutorial for the Icon programming language
Previous: Using arguments in Icon procedures
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John Shipman,
Last updated: 1996/01/06 21:12:57 UT
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