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. Input Validation: Do not accept a number less than 1 or greater than 10.

Answer:

// program in C++.

// headers

#include <bits/stdc++.h>

using namespace std;

// main function

int main()

{

// Variable

   int num;

   cout << "Enter a number between 1 and 10: ";

   // read input

   cin >> num;

   // validate input number

   while(num<1||num>10)

   {

   // if input is wrong then print error message

       cout<<"Wrong input!!Enter again:";

       // read again

       cin>>num;

   }

   // print output

   cout << "The Roman numeral for "<<num<<" is:";

   // switch

   switch (num)

   {

       case 1:

       // if input is 1

           cout<<"I"<<endl;

           // exit the switch

           break;

       case 2:

       // if input is 2

           cout<<"II"<<endl;

           // exit the switch

           break;

       case 3:

       // if input is 3

           cout<<"III"<<endl;

           // exit the switch

           break;

       case 4:

       // if input is 4

           cout<<"IV"<<endl;

           // exit the switch

           break;

       case 5:

       // if input is 5

           cout<<"V"<<endl;

           // exit the switch

           break;

       case 6:

       // if input is 6

           cout<<"VI"<<endl;

           // exit the switch

           break;

       case 7:

       // if input is 7

           cout<<"VII"<<endl;

           // exit the switch

           break;

       case 8:

       // if input is 8

           cout<<"VIII"<<endl;

           // exit the switch

           break;

       case 9:

       // if input is 9

           cout<<"IX"<<endl;

           // exit the switch

           break;

       case 10:

       // if input is 10

           cout<<"X"<<endl;

           // exit the switch

           break;

         // default

       default:

           break;

   }

return 0;

}

Explanation:

Read a number from usr and assign it to variable "num". If the input number is less than 1 or greater than 10 then ask again to enter a number until user  enter a number between 1-10 only.Then with the help of switch() function print  the equivalent Roman number.

Output:

Enter a number between 1 and 10: -5                                                                                        

Wrong input!!Enter again:12                                                                                                

Wrong input!!Enter again:6                                                                                                

The Roman numeral for 6 is:VI