Triangle tools from the text book Programming Processors in Java.
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let
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func factorial (n: Integer): Integer ~
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if n <= 1
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then 1
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else n * factorial (n-1);
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var i: Integer
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in
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begin
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getint (var i);
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putint (i); put ('!');
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put (' '); put ('='); put (' ');
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putint (factorial (i))
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end
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