Question

*KEEP IT SIMPLE PLEASE*

Write a program that allows the user to convert any integer number to Roman numeral and the other way around.

- You should create and print a menu that allows the user to select either Roman to Int or Int to Roman.

- If one option is selected then you should promote the user to enter the number and then you print the equivalence in the other system.

- Validate input, i.e Roman numerals should be greater or equal I.

- Repeat until the user enter -1 (main menu).

• You should use at least one class (.h and .cpp).

Answer 1

// ConsoleApplication1.cpp : Defines the entry point for the console application.
//

#include <iostream>
#include <string>
using namespace std;
void menu(){
   cout << endl;
   cout << ":::::::::::: CALCULATOR :::::::::::::::" <<endl;
   cout << "1. Integer 2 Roman" << endl;
   cout << "2. Roman 2 Integer" << endl;
   cout << "3. Exit" << endl;
   cout << ":::::::::::::::::::::::::::::::::::::::" << endl;
}
int changer(char rom)
{
   if (rom == 'I')
       return 1;
   if (rom == 'V')
       return 5;
   if (rom == 'X')
       return 10;
   if (rom == 'L')
       return 50;
   if (rom == 'C')
       return 100;
   if (rom == 'D')
       return 500;
   if (rom == 'M')
       return 1000;
   return -1;
}
int rom2Dec(string str)
{
   int output = 0;
   for (int i = 0; i<str.size(); i++)
   {
       int state = changer(str[i]);
       if (i + 1 < str.size())
       {
           int state2 = changer(str[i + 1]);
           if (state >= state2)
           {
               output = output + state;
           }
           else
           {
               output = output + state2 - state;
               i++;
           }
       }
       else
       {
           output = output + state;
       }
   }
   return output;
}
void dec2rom(int num){
   int number[] = { 1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1 };
   char *letter[] = { "M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I" };
   int i = 0;
   while (num){
       while (num / number[i]){
           cout<<letter[i];
           num = num-number[i];
       }
       i++;
   }
}
int main(){
   int choice;
   while (1){
       menu();
       cout << "Enter choice: ";
       cin >> choice;
       if (choice == 1){
           int number;
           cout << "Enter number to convert: ";
           cin >> number;
           dec2rom(number);
       }
       else if (choice == 2){
           string roman;
           cout << endl;
           cout << "Enter roman to number: ";
           cin.ignore();
           getline(cin, roman);
           cout<<rom2Dec(roman);
       }
       else {
           return 0;
       }

   }
   return 0;
}

OUTPUT:

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