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Roman numerals/Decode: Difference between revisions
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=={{header|ERRE}}==
<lang ERRE>
PROGRAM ROMAN2ARAB
DIM R%[7]
PROCEDURE TOARAB(ROMAN$->ANS%)
LOCAL I%,J%,P%,N%
FOR I%=LEN(ROMAN$) TO 1 STEP -1 DO
J%=INSTR("IVXLCDM",MID$(ROMAN$,I%,1))
IF J%=0 THEN
ANS%=-9999 ! illegal character
EXIT PROCEDURE
END IF
IF J%>=P% THEN
N%+=R%[J%]
ELSE
N%-=R%[J%]
END IF
P%=J%
END FOR
ANS%=N%
END PROCEDURE
BEGIN
R%[]=(0,1,5,10,50,100,500,1000)
TOARAB("MCMXCIX"->ANS%) PRINT(ANS%)
TOARAB("MMXII"->ANS%) PRINT(ANS%)
TOARAB("MDCLXVI"->ANS%) PRINT(ANS%)
TOARAB("MMMDCCCLXXXVIII"->ANS%) PRINT(ANS%)
END PROGRAM
</lang>
If the answer is -9999, roman number is illegal.
=={{header|Euphoria}}==
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