Write a program in Java that converts a number entered in Roman numerals to deci
ID: 3668573 • Letter: W
Question
Write a program in Java that converts a number entered in Roman numerals to decimal. The program should consist of a class, say Roman. An object of type Roman should do the following (which means these are methods in the class):
a. Store the number as a Roman numeral.
b. Convert and store the number into 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:
Roman Decimal
M 1000
D 500
C 100
L 50
X 10
V 5
I 1
d. The class must contain the method romanToDecimal to convert a Roman numeral into its equivalent decimal number.
e. Write a TestClient to test the class program using the following Roman numerals. The user enters in: MCXIV, CCCLIX, and MDCLXVI
Explanation / Answer
// header files
import java.util.Scanner;
public class Roman {
// declare variables
static String romanNumeral;
static int decimalNum;
public static void main(String args[]) {
Roman rmtoD = new Roman();
rmtoD .convertToDecimal();
rmtoD .printRoman(romanNumeral);
}
// converting to decimal number
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;
// checking the condition
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;
}
}
// print roman letter
public static void printRoman (String romanNumeral){
System.out.println ("The equivalent of the Roman numeral "+romanNumeral+" is "+decimalNum);
}
// decimal number stored
public static void printDecimal (int decimalNum){
System.out.println ("Decimal Number stored is: " + decimalNum);
}
}
sample output
sh-4.3$ javac HelloWorld.java
sh-4.3$ java -Xmx128M -Xms16M HelloWorld
Enter a Roman number: MCXIV
The equivalent of the Roman numeral MCXIV is 1114
sh-4.3$ javac HelloWorld.java
sh-4.3$ java -Xmx128M -Xms16M HelloWorld
Enter a Roman number: CCCLIX
The equivalent of the Roman numeral CCCLIX is 359
sh-4.3$ javac HelloWorld.java
sh-4.3$ java -Xmx128M -Xms16M HelloWorld
Enter a Roman number: MDCLXVI
The equivalent of the Roman numeral MDCLXVI is 1666
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