24 lines
482 B
Text
24 lines
482 B
Text
program Factorial3;
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{$APPTYPE CONSOLE}
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function FactorialTailRecursive(aNumber: Integer): Int64;
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function FactorialHelper(aNumber: Integer; aAccumulator: Int64): Int64;
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begin
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if aNumber = 0 then
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Result := aAccumulator
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else
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Result := FactorialHelper(aNumber - 1, aNumber * aAccumulator);
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end;
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begin
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if aNumber < 1 then
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Result := 1
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else
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Result := FactorialHelper(aNumber, 1);
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end;
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begin
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Writeln('5! = ', FactorialTailRecursive(5));
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end.
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