[X] My Assistant

[bosancero]

Hi I am new Java user with zero experience writing codes. The issue (beside other ) I have is that my entered Roman numerals work only if the numerlas are entered in large to smaller format. For exapmple if I type MMC program will correctly display 2100, but when I enter MCM it will display 2100 instead of 1900. I know that I need to come up with a way to determine what letter comes before so program can subtract it but at this point am little stuck. Here is my code:

CODE

package chapt08;


import javax.swing.JOptionPane;

/* Write a program that converts a number entered in Roman numerals to decimal. Your program should consists

* of a class, say Roman. An objects of the types Roman should do the following:

* a) store the number as 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

* M 1000

* D 500

* C 100

* L 50

* X 10

* V 5

* I 1

*

* d) test your program using the following Roman numerals: MCXIV, CCCLIX and MDCLXVI

*

*/


public class Roman

{



static String romanNumeral;

static int decimalNum;

static char convertToDecimal;


public static void main(String args[])

{


Roman demo = new Roman();

demo.convertToDecimal(decimalNum);

printRoman(romanNumeral);

printDecimal(decimalNum);

setRoman();

toString(romanNumeral);

}



public void convertToDecimal (int other)

{

romanNumeral = JOptionPane.showInputDialog("Enter a Roman numeral to convert to decimal." + "\n\n"+ "Note: Roman numerals are I, V, X, L, C, D and M."+ "\n" + "All letters entered will be treated as capitalized.");

romanNumeral = romanNumeral.toUpperCase();


int x = 0;

do

{


convertToDecimal = romanNumeral.charAt(x); //return a char value from the first character in the string


switch(convertToDecimal)

{

case 'M':

decimalNum += 1000;

break;

case 'D':

decimalNum += 500;

break;

case 'C':

decimalNum += 100;

break;

case 'L':

decimalNum += 50;

break;

case 'X':

decimalNum += 10;

break;

case 'V':

decimalNum += 5;

break;

case 'I':

decimalNum += 1;

break;

}

x++;

}while(x<romanNumeral.length());


//make a condition here...

JOptionPane.showMessageDialog(null, "Roman Numeral Converted to Decimal is: " + decimalNum);// + ch,



//other=decimalNum.getCopy;


}


public static void printRoman (String romanNumeral){


System.out.println ("Roman Numeral stored is: " + romanNumeral);


}

public static void printDecimal (int decimalNum){


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

}

public static void setRoman (){

System.out.println("test Set Roman");


}


// public boolean equals (String romanNumeral, int decimalNum ){

// return (romanNumeral == decimalNum);

// }


public void Other(String temp)

{

temp = "";

}

public Roman getCopy(int decimalNum)

{

Roman temp = new Roman();

Roman.decimalNum = decimalNum;


System.out.println(" temp is: " + temp);

return temp;

}


public static String toString(String str)

{

//str = "test";

if (str==romanNumeral)

System.out.println("Roman numeral " + romanNumeral + " is equal to Decimal Number " + decimalNum);

else

System.out.println("Roman numeral " + romanNumeral + " is not equal to Decimal Number " + str);

return str;

}


}