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Formatting Post Numbers


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What do you mean the rules aren't set?

9 is IX and 4 is IV, but 99 is not IC, it's XCIX. They favor the X over the L. Similarly, 499 is CDXCIX. The rule is consistent for NINES but not for "one less than the next largest digit." It's difficult to do programmatically. Not impossible, just not fun.
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What do you mean the rules aren't set?

9 is IX and 4 is IV, but 99 is not IC, it's XCIX. They favor the X over the L. Similarly, 499 is CDXCIX. The rule is consistent for NINES but not for "one less than the next largest digit." It's difficult to do programmatically. Not impossible, just not fun.

 

The rules for subtraction are (Reference: http://www.factmonst...a/A0769547.html)

 

Several rules apply for subtracting amounts from Roman numerals:

  • a. Only subtract powers of ten (I, X, or C, but not V or L)
     
     
     
     
    For 95, do NOT write VC (100 – 5).

    DO write XCV (XC + V or 90 + 5)

     


  • b. Only subtract one number from another.
     
     
     
     
    For 13, do NOT write IIXV (15 – 1 - 1).

    DO write XIII (X + I + I + I or 10 + 3)


  • c. Do not subtract a number from one that is more than 10 times greater (that is, you can subtract 1 from 10 [iX] but not 1 from 20—there is no such number as IXX.)
     
     
     
     
    For 99, do NOT write IC (C – I or 100 - 1).

    DO write XCIX (XC + IX or 90 + 9)

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