Rimski broj

#include <iostream>
using namespace std;

string rim (int a, int b, int c, int d)
{
       string s = "";

       switch (a)
       {
              case 0: s = s + ""; break;
              case 1: s = s + "M"; break;
              case 2: s = s + "MM"; break;
              case 3: s = s + "MMM"; break;
       }

       switch (b)
       {
              case 0: s = s + ""; break;
              case 1: s = s + "C"; break;
              case 2: s = s + "CC"; break;
              case 3: s = s + "CCC"; break;
              case 4: s = s + "CD"; break;
              case 5: s = s + "D"; break;
              case 6: s = s + "DC"; break;
              case 7: s = s + "DCC"; break;
              case 8: s = s + "DCCC"; break;
              case 9: s = s + "CM"; break;
       }

       switch (c)
       {
              case 0: s = s + ""; break;
              case 1: s = s + "X"; break;
              case 2: s = s + "XX"; break;
              case 3: s = s + "XXX"; break;
              case 4: s = s + "XL"; break;
              case 5: s = s + "L"; break;
              case 6: s = s + "LX"; break;
              case 7: s = s + "LXX"; break;
              case 8: s = s + "LXXX"; break;
              case 9: s = s + "XC"; break;
       }

       switch (d)
       {
              case 0: s = s + ""; break;
              case 1: s = s + "I"; break;
              case 2: s = s + "II"; break;
              case 3: s = s + "III"; break;
              case 4: s = s + "IV"; break;
              case 5: s = s + "V"; break;
              case 6: s = s + "VI"; break;
              case 7: s = s + "VII"; break;
              case 8: s = s + "VIII"; break;
              case 9: s = s + "IX"; break;
       }

       return s;
}


main()
{
      int n, pc, dc, tc, cc;

      cin >> n;

      pc = n/1000;

      dc = n/100%10;

      tc = n/10%10;

      cc = n%10;

      cout << rim(pc, dc, tc, cc) << endl;


      system ("PAUSE");
}