romantodec

public int convertToInt(String roman) {

        //A while loop that loops for the value of length of the roman string entered subtracted by 1 to properly loop through each numeral
        //A while loop is used instead of a for loop for more control within the loop allowing for a proper loop through each numeral
        while(numeralIndex < roman.length()-1) {
            numeralIndex++;

            //This variable stores the current numeral that the loop is iterating through in the entire roman numeral
            numeral = String.valueOf(roman.charAt(numeralIndex));

            //If the loop is at the last roman numeral it will obtain the numeral before it and put it first and combine it with the current numeral after it
            if(numeralIndex == roman.length()-1)
                numeral2 = ((String.valueOf(roman.charAt(numeralIndex-1)) + numeral));
            else //If not, it will set numeral2 to combine the numeral first with the numeral after it
                numeral2 = (numeral + (String.valueOf(roman.charAt(numeralIndex+1))));
            //This will be used later to check if it equals one of the numerals following the subtraction method i.e CM


            //If the current numeral in the loop corresponds to one of the numerals it will add its corresponding decimal value to a total sum variable "decimal"
            if(numeral.equals("M")) {
                decimal += 1000;
            }
            else if(numeral2.equals("CM")) {
                //The same step is done with the numerals following the subtraction method as the singular numerals
                //Although, the numeral index is moved 2x through the loop due to 2 numerals being involved
                decimal += 900;
                numeralIndex++;
            }
            else if(numeral.equals("D")) {
                decimal += 500;
            }
            else if(numeral2.equals("CD")) {
                decimal += 400;
                numeralIndex++;
            }
            else if(numeral.equals("C")) {
                decimal += 100;
            }
            else if(numeral2.equals("XC")) {
                decimal += 90;
                numeralIndex++;
            }
            else if(numeral.equals("L")) {
                decimal += 50;
            }
            else if(numeral2.equals("XL")) {
                decimal += 40;
                numeralIndex++;
            }
            else if(numeral.equals("X")) {
                decimal += 10;
            }
            else if(numeral2.equals("IX")) {
                decimal += 9;
                numeralIndex++;
            }
            else if(numeral.equals("V")) {
                decimal += 5;
            }
            else if(numeral2.equals("IV")) {
                decimal += 4;
                numeralIndex++;
            }
            else if(numeral.equals("I")) {
                decimal += 1;
            }
        }
        //Once there are no more numerals to loop through it will return the converted decimal value of the roman numeral
        return decimal;
    }