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Using arguments in Icon procedures

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Each Icon procedure starts with the keyword procedure followed by the name of the procedure, and a pair of parentheses enclosing the arguments to the procedure. Here is an example of a procedure that computes the function C(n,k) = n!/(k!(n-k)!), the number of combinations of n different objects taken k at a time:

procedure C(n,k)
# Returns the number of combinations of n things taken k at a
# time, given by C(n,k) = n! / ( k! * (n-k)! )
  return Factorial ( n ) /
    ( Factorial ( k ) * Factorial ( n - k ) );
The statement ``return e'' computes the value of the expression e and exits the procedure, substituting the value of e into the calling expression at the location in the program where the procedure was invoked.

(See the previous page, `Using procedures in Icon', for the Factorial() procedure.)

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See also: A tutorial for the Icon programming language
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John Shipman,
Last updated: 1996/01/06 21:12:57 UT
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