Write a program that asks the user to enter a number within the range of 1 through 10. use a switch statement to display the roman numeral version of that number.

The JAVA program is shown below.  

import java.util.Scanner;

import java.lang.*;

public class Roman {      

   public static void main(String args[]) {    

   Scanner sc = new Scanner(System.in);

   int num;    

   do

   {

       System.out.println("Enter any number from 1 to 10 to display it in Roman Number");

       num = sc.nextInt();        

       if(num<1 || num>10)

       {

           System.out.println("Invalid input.");

           System.out.println("Enter any number from 1 to 10 to display it in Roman Number");

           num = sc.nextInt();

       }                    

   }while(num<1 || num>10);    

   System.out.print("The Roman numeral for "+num+" is ");

   switch(num)

   {

       case 1: System.out.println("I");

               break;

       case 2: System.out.println("II");

               break;                

       case 3: System.out.println("III");

               break;                

       case 4: System.out.println("IV");

               break;                

       case 5: System.out.println("V");

               break;                  

       case 6: System.out.println("VI");

               break;                

       case 7: System.out.println("VII");

               break;                

       case 8: System.out.println("VIII");

               break;                

       case 9: System.out.println("IX");

               break;                

       case 10: System.out.println("X");

               break;

   }

}

}

OUTPUT

Enter any number from 1 to 10 to display it in Roman Number

100

Invalid input.

Enter any number from 1 to 10 to display it in Roman Number

11

Enter any number from 1 to 10 to display it in Roman Number

7

The Roman numeral for 7 is VII

Explanation:

This program begins where user inputs a number from 1 to 10 to display its equivalent roman numeral.

The user input is validated using if statement inside a do while loop.

do

   {

       System.out.println("Enter any number from 1 to 10 to display it in Roman Number");

       num = sc.nextInt();

       if(num<1 || num>10)

       {

           System.out.println("Invalid input.");

           System.out.println("Enter any number from 1 to 10 to display it in Roman Number");

           num = sc.nextInt();

       }                    

   }while(num<1 || num>10);

   The switch case is executed over the user input. Each switch case ends with a break statement. When a particular case from the switch statement is satisfied and executed, the switch statement is executed by break.

There is no default case in switch statement since user input is validated before entering the switch statement.

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