Using arguments in Icon procedures
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 ) );
end
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.)