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Thread: Romain to arabic numbers converter

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    Question Romain to arabic numbers converter

    Hi! so right now i'm trying to do a program to convert romain numbers to arabic numbers. My problem is that I don't have the right to use Methods and Arrays. Only loops and if/else. I actually have no clue on how to do it. N.B. I want clues, not all the code. #wouldbesomuchsimplewithaarrays


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    Default Re: Romain to arabic numbers converter

    Can you post some examples of the input and desired output?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Romain to arabic numbers converter

    Exemple of the execution in the CMD:
    java romaintoarabic MCXI
    Converted number : 1111

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    Default Re: Romain to arabic numbers converter

    It's impossible to do what you've shown in Post #3 without using arrays. MCXI will be in args[0], and that's an array element. I'm also curious if you can use String's methods. Please be clearer about what you can/can't do or use and post what you've done so far.

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    Default Re: Romain to arabic numbers converter

    Can you explain the logic for what to do with each Roman numeral character as it is read from the full number?
    For example what would you do with the 'C' from CM?
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    Default Re: Romain to arabic numbers converter

    Oh I'm sorry. I'm not counting it as a method. But you're right, I'm using the string method. As this point I can convert every single character to a numeral value and add them to each other. But here is my problem: Ex: java romaintoarabic IX Converted number : 11 But actually it should five me 9.

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    Default Re: Romain to arabic numbers converter

    IX Converted number : 11 But actually it should five me 9.
    Given "IX" what does the code need to do when it sees the 'I'?

    Does the code need to reject invalid input: IXL or MCCM
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Romain to arabic numbers converter

    How are we supposed to help you without seeing your code and understanding all of the rules?

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    Default Re: Romain to arabic numbers converter

    I just actually don't know how to do it. Found out that my code is dope

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    Default Re: Romain to arabic numbers converter

    If you don't know the rules for constructing Roman numerals it will be very hard to write code to convert them. Do some research.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Romain to arabic numbers converter

    It is possible to convert Roman numbers to Arabic numbers by using loop and if-else statement. Here is my suggestion: read the Roman numbers from the left to the right. If the leftmost number is greater than the number next to it (to the right), then that number (the leftmost) is a positive number. If it is not, then it is a negative number. Then keep comparing the next number (to the right). Notice: in case both successive numbers are equal, treat them like a single number, and keep comparing.

    For example: XIV. We first compare X and I. Since X is greater than I, X is a positive number (+10). Then compare I and V. Since I is less than V, then I = -1. After V there is no number, then V = +5. So +10 - 1 + 5 = 14.

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