I have made a program that is supposed to convert roman numerals to decimals. It is NOT supposed to convert decimals to roman numerals. The only problem it seems there is with the program is that it only adds and does NOT subtract. This causes some roman numeral conversions to be flawed. What can I try to fix this. Keep in mind that the reason some methods exist is because the directions for the code say that I have to make it this way.
Instructions:
Write a program that converts a number entered in Roman numerals to decimal. Your program should consist of a class called Roman. An object of type Roman should be able to do the following:
1) Store the number as a Roman numeral.
2) Convert and store the number into decimal.
3) Print the number as a Roman numeral or decimal number as requested by the user. (Be sure to over-ride the toString function).
4) Your class must contain the method romanToDecimal to convert a Roman numeral into its equivalent decimal number.
5) Test your program using the following Roman numerals: MCXIV, CCCLIX, and MDCLXVI.
This is what I have so far. It compiles and there are no errors, but it does not subtract I from X, or I from V and so on. For example,CMXLVII should be 947, but the program outputs 1067.
import javax.swing.*;
import java.util.*;
public class Roman{
private String roman;
private int decimal;
public int romanToDecimal(String s)
I got part of this converter built and running fine but now it's getting weird. Specifically I am getting to the part where I have to count above ten which means things like attaching Vs to Is and Xs and suchlike.
I know I have to use an .append someplace, I am just not certain how to go about it. I've been playing with it some, but this is honestly the biggest thing I've built so far that actually *ran* so I'm afraid to poke too many holes in it... where do I start? It's not like I can invent another return string and concatenate them. R is what I've got.
package hello; public class RomansatHomans { public static void main(String[] args) { // input fed on this line loops through toRo and comes back as a String // R String R = toRo(23); // int D = froRo("x");
I am trying to write a program that asks the user to enter a number from 1 through 10 and then the program will display the roman numeral for that number.
I am also adding a error message in which i haven't yet because im still trying to figure out how to the program will do the roman numeral.'
I have used the if and else if. but when i input a number it just repeats the number back to me.
The program cimpiles but it doesn't do what i want. here is what i have so far. how can i get the program to display the roman numeral after the number is entered.
import javax.swing.JOptionPane; public class Romannumeral { public static void main(String[] args) { double number;
Write a program called RomanNumeralHelper that allows a user to enter a roman numeral and then outputs the integer number value. Use a Scanner to accept command line input from the user and continually ask for a roman numeral until the user enters Q (or q) to stop. Your solution should NOT use a switch statement.
Here is sample input / output:
Enter a roman numeral [Q | q to quit]: III >> 3 Enter a roman numeral [Q | q to quit]: IV >> 4 Enter a roman numeral [Q | q to quit]: V >> 5 Enter a roman numeral [Q | q to quit]: Q Good Bye!
This is what I have so far in my code, but I cant get what the user inputs when I want it to output the number.
import java.util.Scanner; public class RomanNumber4 { public static void main(String[] args) { // obtain input from command window Scanner input = new Scanner(System.in);
I am a student taking a Java programming class. My assignment is to write a program that converts a roman numeral input as entered by a user and converting it to it's integer value (arabic number). These are the methods that I must have in it:
1. Write a method that takes input from the user and passes it to a conversion method. 2. Write a method that yields the numeric value of each of the letters (conversion method). 3. Write a method that outputs the number the user entered and the converted number. 4. Write a main method to test the 3 methods.
I have written the first method, at least I think. Here is what I did there:
public static String romanInput(String number) { Scanner numberInput = new Scanner (System.in); System.out.print("Enter a roman numeral: "); String userInput = numberInput.next(); return userInput; }
I returned the userInput and I think that is passing it to the conversion method? Now I am working on this conversion method and to be honest I don't know where to begin. I am told how to convert a string in my assignment by the professor. I am told:
- Look at the first two characters. If the first has a larger value than the second, then simply convert the first. - Call the conversion method again for the substring starting with the second character. -Add both values. If the first one has a smaller value than the second, compute the difference and add to it the conversion of the tail.
I am also told to use a single-dimensional array. But, I don't know what I am to use a single dimensional array for? So this is what I wrote so far for this method:
I have written a character array for the roman numerals, and then one for arabic numerals, then I set them equal to each other. I also declared an integer variable set to 0 because I think that is what I will be returning at the end of the method. Now I don't know where to start for the conversion algorithm here. I know this is what I have to do, but I don't know how to do it:
1. Add the numbers together if they are in decreasing value or are equal in value. For example: VI is read as 5 + 1 = 6 XVI is read as 10 + 5 + 1 = 16 XXXVIII is 10 + 10 + 10 + 5 + 1 + 1 + 1 = 38 2. Use subtraction if a number is less than the number that follows it. For example, I is less than V, so when I is in front of V, you subtract its value. 3. For example: IV is 5 1 = 4 IX is 10 1 = 9 XL is 50 10 = 40 MCM is 1,000 + (1,000 - 100) = 1,900
I can't use hashtables or enums because I haven't learned about that yet. I have a feeling I need to use a for loop. I know I haven't done any of the actual programming work but I don't know how to begin writing this conversion method.
I have tried as much as I can to place code to give me only two decimals in answers but cannot get it to work not sure if placement or syntax.This is code so far and it works but gives answers to 8 decimals.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> <title>Untitled Document</title> </head>
My program is supposed to operate on decimals because it concerns volume of packagings. I learnt that what normally is simple arithmetic (100 cm × 75 cm × 60 cm = 0.45 m³) in Java gives only approximate value (something like 0.44(9) m³ in this case). That's close enough so I probably shouldn't worry, but the thing is that although for one packaging the difference is barely visible—if at all—for thousands of packagings it'll make a difference. It'll be worse when I get to counting money.
I found two solutions: 1) Using integers and so-called decorative decimal point on display. I have a bad feeling about this, though. 2) Using BigDecimal.
Now, BigDecimal seems like a nice solution. I tried it and so far it looks okay. But just look at an excerpt from my program that I had to re-write (previously it looked perfectly fine as a single line):
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import java.util.Scanner; import java.text.DecimalFormat; public class Chapter2PE3 { public static void main (String[]args){ Scanner input = new Scanner (System.in);
I'm trying to do a program to convert roman numbers to arabic numbers. My problem is that I don't have the right to use Methods and Arrays. Only loops and if/else.
Im working on a roman numeral to arabic converter and all I had to do was fill out the conversion method romanToDecimal. But for some reason no matter what number I enter It always says my number is equal to one.
//Quiz 1 EC import java.util.*; class Roman { private String romanNum; private int decimalNum; public Roman(){ romanNum = "I"; decimalNum = 1;
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[Code] ....
This is my error:
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[Code] .....
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