forked from KolibriOS/kolibrios
59 lines
888 B
Plaintext
59 lines
888 B
Plaintext
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(*
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adapted to Oberon-07 by 0CodErr, KolibriOS team
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*)
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(*
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* Written by Andrew Cadach
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*
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* Recursive (extremely uneficient:-) implementation of factorial
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*
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* n * (n-1)!, n <> 0
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* By definition, n! =
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* 1, n = 0
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*
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*)
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MODULE fact;
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IMPORT In, Out, Console;
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CONST
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MAX_INTEGER = ROR(-2, 1);
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VAR
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i, r: INTEGER;
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PROCEDURE f (n: INTEGER): INTEGER;
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VAR
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Res: INTEGER;
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BEGIN
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IF n = 0 THEN
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Res := 1
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ELSE
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Res := n * f (n - 1)
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END
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RETURN Res
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END f;
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BEGIN
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Console.open;
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i := 0;
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REPEAT
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r := f(i);
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Out.String ("The factorial of ");
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Out.Int (i, 2);
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Out.String (" is ");
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Out.Int (r, 0);
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Out.Ln;
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INC(i)
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UNTIL r >= MAX_INTEGER DIV i;
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In.Ln;
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Console.exit(TRUE)
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END fact.
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