Fibonacci in Mathematica

Published on 28 April 2022 (Updated: 02 February 2023)

Fibonacci in Mathematica

Welcome to the Fibonacci in Mathematica page! Here, you’ll find the source code for this program as well as a description of how the program works.

Current Solution

(* Code *)

(* It would be easy to simply print these out in a 'for' loop; however, in the spirit
of keeping the mathematical operation separate from the UI I opted to return
the Fibonacci sequence as a list explicitly: *)

fibonacciSequence[0] := {} (* special case *)
fibonacciSequence[1] := {1} (* special case *)
fibonacciSequence[n_] := Nest[Append[#, #[[-2]] + #[[-1]]] &, {1, 1}, n - 2]

(* The outer function provides the 'user interface': *)

fibonacciSequenceMain = Function[n,
   Catch[
    Module[{s},
     s = fibonacciSequence[
       (* convert string to integer, or throw *)
       If[StringMatchQ[n, DigitCharacter ..],
        FromDigits[n],
        Throw[
         "Usage: please input the count of fibonacci numbers to output"]]];
     Do[Print[i, ": ", s[[i]]], {i, Length[s]}]]]];


(* Valid Tests *)

fibonacciSequenceMain /@ {"1", "2", "5", "10"};


(* Invalid Tests *)

fibonacciSequenceMain[""]
fibonacciSequenceMain["word"]

Fibonacci in Mathematica was written by:

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How to Implement the Solution

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How to Run the Solution

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