Question

display the roman numeral version of that number (I, II, III, IV, V … X). If the number entered by user is outside the range of 1-10, the program should display an error message. Code a driver class RomanNumeralsAppto test the class by asking user to enter a number, creating an object of RomanNumeralsand calling its methods getNumber, setNumber, convertNumand displayResultto perform the described task.
Coding Requirements:
•
Must use required/meaningful names for fields, variables, methods and classes.
•
Must document each of your source code (see example in the next slide)
•
Must separate operation class RomanNumeralsfrom the driver class

Answer 1

RomanNumerals.java

public class RomanNumerals {
  
   int number;
   String romanNum;
  
   public int getNumber() {
       return number;
   }
   public void setNumber(int number) {
       this.number = number;
   }
  
   public void convertNum(int number){
       if(number==1)
           this.romanNum="I";
       else if(number==2)
           this.romanNum="II";
       else if(number==3)
           this.romanNum="III";
       else if(number==4)
           this.romanNum="IV";
       else if(number==5)
           this.romanNum="V";
       else if(number==6)
           this.romanNum="VI";
       else if(number==7)
           this.romanNum="VII";
       else if(number==8)
           this.romanNum="VIII";
       else if(number==9)
           this.romanNum="IX";
       else if(number==10)
           this.romanNum="X";  
   }
  
   public String displayResult(){
       return this.romanNum;
   }

}

RomanNumeralsApp.java

import java.util.Scanner;

public class RomanNumeralsApp { //driver class
  
   public static void main(String[] args) {
       RomanNumerals numerals=new RomanNumerals(); // create instance
       Scanner scanner=new Scanner(System.in);
       System.out.println("Enter a number : ");
       int N=scanner.nextInt();
       if(N>0 && N<11){
           numerals.setNumber(N); // set number
           numerals.convertNum(numerals.getNumber()); // convert number into roman numeral
           System.out.println("Roman Numeral of "+numerals.getNumber()+" is "+numerals.displayResult());   // display result
       }
       else{
           System.out.println("Error : Number outside of range 1-10"); // error
       }
       scanner.close();
   }

}

Output :