Roman numerals/Decode: Difference between revisions
Roman numerals/Decode en True BASIC
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error: IM
error: XXCIII</pre>
=={{header|True BASIC}}==
<lang qbasic>FUNCTION romtodec(roman$)
LET num = 0
LET prenum = 0
FOR i = len(roman$) to 1 step -1
LET x$ = (roman$)[i:i+1-1]
LET n = 0
IF x$ = "M" then LET n = 1000
IF x$ = "D" then LET n = 500
IF x$ = "C" then LET n = 100
IF x$ = "L" then LET n = 50
IF x$ = "X" then LET n = 10
IF x$ = "V" then LET n = 5
IF x$ = "I" then LET n = 1
IF n < prenum then LET num = num-n else LET num = num+n
LET prenum = n
NEXT i
LET romtodec = num
END FUNCTION
!Testing
PRINT "MCMXCIX = "; romToDec("MCMXCIX") !1999
PRINT "MDCLXVI = "; romToDec("MDCLXVI") !1666
PRINT "XXV = "; romToDec("XXV") !25
PRINT "CMLIV = "; romToDec("CMLIV") !954
PRINT "MMXI = "; romToDec("MMXI") !2011
END</lang>
=={{header|TUSCRIPT}}==
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