roman numerals to numbers converter code example

Example 1: Roman Numeral Converter

// Visit=> https://duniya-roman-numeral-converter.netlify.app/
const convertToRoman = num => {
    const numbers = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1]
    const roman = ['M','CM','D','CD','C','XC','L','XL','X','IX','V','IV','I']
    let romanNumeral = ''

    // While num is not equal to 0, keep iterating with the value
    while(num !== 0){
      	// Find from the numbers array the match for the current number
        const index = numbers.findIndex(nums => num >= nums)
        
        // Keeping pushing the roman value to romanNumeral
        // Cause the found number from numbers matches the index of its
        // Corresponding roman below
        romanNumeral += roman[index]
      
      	// Set num to a new value by Substracting the used number from it 
        num -= numbers[index]
    }

    return romanNumeral
}

convertToRoman(3999);

// With love @kouqhar

Example 2: roman numbers to numbers

//Java Implementation of Roman To Number


public class RomanToNumber {
	public static int declareIntOfChar(char c)
	{
		int val=0;
		switch(c)
		{
		case 'I':
			val=1;
			break;
		case 'V':
			val=5;
			break;
		case 'X':
			val=10;
			break;
		case 'L' : 
			val=50;
			break;
		case 'C' : 
			val=100;
			break;
		case 'D' : 
			val=500;
			break;
		case 'M' : 
			val=1000;
			break;
		default :
			val=-1;	
			break;
		}
		return val;
	}
	public static void main(String[] args) {
		String s = "XCV";
		int sum = 0,c1,c2;
		for(int i=0;i<s.length();i++)
		{
			c1=declareIntOfChar(s.charAt(i));
			if(i+1<s.length())
			{
				c2=declareIntOfChar(s.charAt(i+1));
				if(c1<c2)
				{
					sum = sum + c2 - c1;
					i++;
				}
				else
				{
					sum = sum + c1;
				}
			}
			else
			{
				sum = sum + c1;
			}
		}
		System.out.print(s + " = " + sum);
	}
}