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FileMaker Pro Custom Functions

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RomanNumberal_1to4K(Parameter_number)

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Average rating: 3.8 (11 votes)
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Brad Lowry, Brad Lowry Consulting
http://www.bradlowryconsulting.com

Returns a Roman Numeral up to 3,999

Sample Input:

RomanNumberal_1to4K(1999)

Sample Output:

MCMXCIX

Case ( Parameter_number <> Int (Parameter_number); "ERROR: invalid input, input must be a postive INTEGER less than 4000"; Parameter_number <= 0; "ERROR: invalid input, input must be a POSITIVE integer less than 4000"; Parameter_number > 3999; "ERROR: invalid input, input must be a positive integer LESS THAN 4000"; Let ( [thousands = Mod(Int(Parameter_number/1000); 10); comment = Case(1 = 2; "other values skipped since 3K is max"); postMs = Left("MMM"; thousands)]; postMs) & Let ( [hundreds = Mod(Int(Parameter_number/100); 10); preCs = Case(Mod(hundreds; 5) = 4; "C"); ofMorD = Case(hundreds = 9; "M"; hundreds >= 4; "D"); postCs = Case(Mod(hundreds; 5) ≤ 3; Left("CCC"; Mod(hundreds; 5)))]; preCs & ofMorD & postCs) & Let ( [tens = Mod(Int(Parameter_number/10); 10); preXs = Case(Mod(tens; 5) = 4; "X"); ofCorL = Case(tens = 9; "C"; tens >= 4; "L"); postXs = Case(Mod(tens; 5) ≤ 3; Left("XXX"; Mod(tens; 5)))]; preXs & ofCorL & postXs) & Let ( [ones = Mod(Int(Parameter_number/1); 10); preIs = Case(Mod(ones; 5) = 4; "I"); ofXorV = Case(ones = 9; "X"; ones >= 4; "V"); postIs = Case(Mod(ones; 5) ≤ 3; Left("III"; Mod(ones; 5)))]; preIs & ofXorV & postIs) )
Then copy & paste into FileMaker Advanced's Edit Custom Function window.

Click here to copy To Clip Manager if you have myFMbutler's Clip Manager installed

Description:

This allows you to take any poisitive integer value and return the equivelent Roman Numeral (up to 3,999).

For this submission Ichose to included validation error text, in actual use I might just leave the results empty when not valid, or alternately make it valid by truncating anything beyond 4000, truncating decimals and taking the absolute value of the input.

It is my understanding that 4000 and beyond require special characters so that was not attempted. I am pretty confident in my method, but not in my the exacting values for Roman Numeral results thus error reports would be welcomed.

Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

This is my Custom Function and I want to edit it

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