Convert the number to Roman numerals

[ŖàΫ ỏƒ Ңόρę]

Hi

I have been asked to write code that converts the number to Roman numerals.

Fortunately, I wrote the code and it works properly.

My question is

In standard Roman numerals, no more than three consecutive copies of the same letter are used.

I have tried many times to discover what the proper statement which I must write in my code is that voids using three consecutive copies of the same letter

this is the code

import java.util.Scanner;

public class RomanNumeral {
	public static void main(String[] args){
		
		Scanner scan = new Scanner(System.in);
		System.out.print("Please enter a number between 1 and 3999: ");
		int number = scan.nextInt();
		
		String roman="";
		
		
		while(number<=0 || number>3999){
			System.out.println("Invalid input.  You must enter a number between 1 and 3999");
			System.out.print("Please enter another number now: ");
			number = scan.nextInt();
			}
		
		while(number>=1000){
			roman += "M";
			number-=1000;
		}
		
		while(number>=900){
			roman += "CM";
			number-=900;
		}
		
		while(number>=500){
			roman += "D";
			number-=500;
		}
		
		while(number>=400){
			roman += "CD";
			number-=400;
		}
		
		while(number>=100){
			roman += "C";
			number-=100;
		}
		
		while(number>=90){
			roman += "XC";
			number-=90;
		}
		
		while(number>=50){
			roman += "L";
			number-=50;
		}
		
		while(number>=40){
			roman += "XL";
			number-=40;
		}
		
		while(number>=10){
			roman += "X";
			number-=10;
		}
		
		while(number>=9){
			roman += "IX";
			number-=9;
		}
		
		while(number>=5){
			roman += "V";
			number-=5;
		}
		
		while(number>=4){
			roman += "IV";
			number-=4;
		}
		
		while(number>=1){
			roman += "I";
			number-=1;
		}
		
		System.out.println(roman);
	}
}

I hope you can help me

Thanks

:)

[Fubarable]

Hi
Fortunately, I wrote the code and it works properly.

I have tried many times to discover what the proper statement which I must write in my code is that voids using three consecutive copies of the same letter

It's OK for 3 consecutive letters to occur, just not 4. Your code seems to me to work just fine, so I'm not sure what your question is.

Oh, and thanks for starting a new thread! :)

[al_Marshy_1981]

removed......

[Fubarable]

If the number entered was 1111, then the roman String would be: "IIII" which is wrong. I think that is what he means.

Huh? If I run this code and enter "1111" I get MCXI back which is the correct answer. Am I missing something here?

[al_Marshy_1981]

haha yes you are right I thought number was being reduced to zero for some reason in each while loop. Time for bed I think :D

[ŖàΫ ỏƒ Ңόρę]

Thank u 4 response

I have another problem

The output should be the same format

Please enter a number between 1 and 3999: 1073
0 in Roman numerals is MLXXIII

Instead of 0 , the programe must gives the same number that the user has entered

I've tried to fix this problem but I couldn't

[Fubarable]

Thank u 4 response

You're welcome, but what the heck happened to your first problem? Have you decided to just ignore it? We need closure here.

edit: hm, I guess you've been abducted by aliens...

[ŖàΫ ỏƒ Ңόρę]

Hi Fubarable

Thank you for your passing and responsing

About the first problem, I read your response and I saw there is no problem

I just was confused by this rule

In standard Roman numerals, no more than three consecutive copies of the same letter are used.

Also the second problem, I fixed yesterday

This is code after fixing

import java.util.Scanner;

public class RomanNumeral {
	public static void main(String[] args){
		
		Scanner scan = new Scanner(System.in);
		System.out.print("Please enter a number between 1 and 3999: ");
		int number = scan.nextInt();
		[COLOR="Red"]int number1 = number;[/COLOR] // I wrote this variable to hold the number that the user enters
		
		String roman="";
		
		
		while(number<=0 || number>3999){
			System.out.println("Invalid input.  You must enter a number between 1 and 3999");
			System.out.print("Please enter another number now: ");
			number = scan.nextInt();
			[COLOR="Red"]number1=number;[/COLOR]
			}
		
		while(number>=1000){
			roman += "M";
			number-=1000;
		}
		
		while(number>=900){
			roman += "CM";
			number-=900;
		}
		
		while(number>=500){
			roman += "D";
			number-=500;
		}
		
		while(number>=400){
			roman += "CD";
			number-=400;
		}
		
		while(number>=100){
			roman += "C";
			number-=100;
		}
		
		while(number>=90){
			roman += "XC";
			number-=90;
		}
		
		while(number>=50){
			roman += "L";
			number-=50;
		}
		
		while(number>=40){
			roman += "XL";
			number-=40;
		}
		
		while(number>=10){
			roman += "X";
			number-=10;
		}
		
		while(number>=9){
			roman += "IX";
			number-=9;
		}
		
		while(number>=5){
			roman += "V";
			number-=5;
		}
		
		while(number>=4){
			roman += "IV";
			number-=4;
		}
		
		while(number>=1){
			roman += "I";
			number-=1;
		}
		
		System.out.println(number1 + " in Roman numerals is " + roman);
	}
}

If there is another way to solve that please tell me.

Thanks

[Rocknsock]

import java.util.Scanner;


public class Teste {


public static void main(String[] args) {
Scanner sc =new Scanner(System.in);
System.out.println("Type a number");
int num = -1;
String roman = "";
do{
if(sc.hasNextInt())
num = sc.nextInt();
else{
System.out.println("Error");
sc.nextLine();
sc.next();
}

}while(num<=0 && num>3999);


while(num>=900){
if(num==900){
roman+="CM";
num=0;
}
else{
roman+="M";
num-=1000;
}
}
while(num>=400){
if(num==400){
roman+="CD";
num=0;
}
else{
roman+="D";
num-=500;
}
}
while(num>=90){
if(num==90){
roman+="XC";
num=0;
}
else{
roman+="C";
num-=100;
}
}
while(num>=40){
if(num==40){
roman+="XL";
num=0;
}
else{
roman+="L";
num-=50;
}
}
while(num>=9){
if(num==9){
roman+="IX";
num=0;
}
else{
roman+="X";
num-=10;
}
}
while(num>=4){
if(num==4){
roman+="IIIV";
num=0;
}
else{
roman+="V";
num-=5;
}
}
while(num>=1){
roman+="I";
num-=1;
}
System.out.println("Msg " +roman);



}

}

[doWhile]

@Rocknsock, any reason you decided to resurrect a thread that is almost 3 years old to spoonfeed code? Recommended reading:
The Problem with Spoon-feeding