Java Programming: Write a program that converts a number entered in Roman Numera

Question

Java Programming:

Write a program that converts a number entered in Roman Numerals to decimal. Your program should consist of a class, say, Roman. An Object of type "Roman" should do the following:

a. Store the number as a Roman numeral.

b. Convert and store the number into a decimal.

c. Print the number as a Roman Numeral or decimal number as requested by the user.

The decimal values of the Roman numerals are:

M=1000

D= 500

C=100

L=50

X=10

V=5

I=1

d. Your class must contain the method "romanToDecimal" to convert a Roman numeral into its equivalent decimal number.

e. Test your program using the following Roman Numerals: MCXIV, CCCLIX, MDCLXVI

Explanation / Answer

import java.util.Scanner;

public class Roman {

static String romanNumeral;

static int decimalNum;

public static void main(String args[]) {

Roman rmtoD = new Roman();

rmtoD .convertToDecimal();

rmtoD .printRoman(romanNumeral);

}

public void convertToDecimal () {

Scanner scan = new Scanner(System.in);

System.out.print("Enter a Roman number: ");

romanNumeral = scan.nextLine();

romanNumeral = romanNumeral.toUpperCase();

int l= romanNumeral.length();

int num=0;

int previousnum = 0;

for (int i=l-1;i>=0;i--)

{

char x = romanNumeral.charAt(i);

x = Character.toUpperCase(x);

switch(x)

{

case 'I':

previousnum = num;

num = 1;

break;

case 'V':

previousnum = num;

num = 5;

break;

case 'X':

previousnum = num;

num = 10;

break;

case 'L':

previousnum = num;

num = 50;

break;

case 'C':

previousnum = num;

num = 100;

break;

case 'D':

previousnum = num;

num = 500;

break;

case 'M':

previousnum = num;

num = 1000;

break;

}

if (num<previousnum)

{decimalNum= decimalNum-num;}

else

decimalNum= decimalNum+num;

}

}

public static void printRoman (String romanNumeral){

System.out.println ("The equivalent of the Roman numeral "+romanNumeral+" is "+decimalNum);

}

public static void printDecimal (int decimalNum){

System.out.println ("Decimal Number stored is: " + decimalNum);

}

}

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