We are replacing the normal roman numeral letters V and I with A and B. Example:

ID: 3667849 • Letter: W

Question

We are replacing the normal roman numeral letters V and I with A and B.

Example: BA = 4 AB = 6

Write a program that converts a number entered in Roman numerals to an integer. Your program should consist of a class name RomandConvert. This class has the following: A. Has 2 data members which are rNum (string) and iNum (int) B. A function that calculates from Roman to Integer C. A function that prints the data members (like we have done in class.) The integer values of the Roman numerals are: In your main function (your test client). Implement a test1 function with BBB passed in as a value using the Constructor. In addition, implement a test2 function width BA using a setter function. Last, implement a test3 function with ABA using default constructor (this requires some thought). On all test, do not prompt the user; in addition, show all output to console.

Explanation / Answer

public class RomanToDecimal {
public static void romanToDecimal(java.lang.String romanNumber) {
    int decimal = 0;
    int lastNumber = 0;
    String romanNumeral = romanNumber.toUpperCase();
         /* operation to be performed on upper cases even if user enters roman values in lower case chars */
    for (int x = romanNumeral.length() - 1; x >= 0 ; x--) {
        char convertToDecimal = romanNumeral.charAt(x);

        switch (convertToDecimal) {
            case 'M':
                decimal = processDecimal(1000, lastNumber, decimal);
                lastNumber = 1000;
                break;

            case 'D':
                decimal = processDecimal(500, lastNumber, decimal);
                lastNumber = 500;
                break;

            case 'C':
                decimal = processDecimal(100, lastNumber, decimal);
                lastNumber = 100;
                break;

            case 'L':
                decimal = processDecimal(50, lastNumber, decimal);
                lastNumber = 50;
                break;

            case 'X':
                decimal = processDecimal(10, lastNumber, decimal);
                lastNumber = 10;
                break;

            case 'A':
                decimal = processDecimal(5, lastNumber, decimal);
                lastNumber = 5;
                break;

            case 'B':
                decimal = processDecimal(1, lastNumber, decimal);
                lastNumber = 1;
                break;
        }
    }
    System.out.println(decimal);
}

public static int processDecimal(int decimal, int lastNumber, int lastDecimal) {
    if (lastNumber > decimal) {
        return lastDecimal - decimal;
    } else {
        return lastDecimal + decimal;
    }
}

public static void main(java.lang.String args[]) {
    romanToDecimal("AB");
}
}

//SAmple output-->

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We are replacing the normal roman numeral letters V and I with A and B. Example:

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