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Roman numeral encoder in Windows batch

 
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Brent
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Joined: 01 Jul 2005
Posts: 729

PostPosted: Feb 4th, 2014, 5:01am    Post subject: Roman numeral encoder in Windows batch Reply with quote

Every now and then I like to challenge myself by writing a program in Windows batch just to see if it can be done. This is a task from Rosetta Code to convert a number to Roman numeral.
Code:
@Echo Off
SetLocal EnableDelayedExpansion

For %%n In (1666 1888 1999 2000) Do (
  Call :toRoman %%n
  Echo %%n = !roman!
)

GoTo :EOF

:toRoman value
:: Converts an integer value to a Roman numeral. Result is in %roman%.
  Set value=%1
  Set "Roman="
  If Not Defined arabic.0 (
    Call :SetArray arabic 0=1000 1=900 2=500 3=400 4=100 5=90 6=50 7=40 8=10 9=9 10=5 11=4 12=1
    Call :SetArray roman 0=M 1=CM 2=D 3=CD 4=C 5=XC 6=L 7=XL 8=X 9=IX 10=V 11=IV 12=I
  )
  For /L %%i In (0,1,12) Do Call :toRoman_Loop %%i
  GoTo :EOF

:toRoman_Loop 1
:: Called by :toRoman to do much of the work. No other code should call this.
  If !value! LSS !arabic.%1! GoTo :EOF
  Set "Roman=!Roman!!roman.%1!"
  Set /A value-=!arabic.%1!
  GoTo toRoman_Loop

:SetArray name index1=value1 index2=value2 etc
:: Creates a pseudo-array of variables of the form "name.index"
  If "%2" EQU "" GoTo :EOF
  Set "%1.%2=%3"
  Shift /2
  Shift /2
  GoTo SetArray

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Brent


Last edited by Brent on Feb 5th, 2014, 5:28pm; edited 1 time in total
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STPendl
Full Member


Joined: 20 Aug 2007
Posts: 161
Location: Austria

PostPosted: Feb 4th, 2014, 7:21pm    Post subject: Re: Roman numeral encoder in Windows batch Reply with quote

This is a nice showcase of working around the shortcomings of Windows command scripts Wink

I really like this approach Wink

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Stefan

Any code I post can be freely used, just give credit.
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Brent
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Joined: 01 Jul 2005
Posts: 729

PostPosted: Feb 5th, 2014, 5:36pm    Post subject: Re: Roman numeral encoder in Windows batch Reply with quote

Thanks, Stefan.

BTW, I edited the code to eliminate any chance of accidental spaces that might be introduced by the forum software.

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Brent
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