Civic Dill Mix

#include <iostream>
#include <stdio.h>
#include <string.h>

#define MAXS 5000

using namespace std;

void roman_num(int);
int num_roman(char numero_R[500]);

int main()
{
   int cases;
   char roman[MAXS];
   int suma=0;
   int I = 0;
   int cas = 1;

   while (cin >> cases,cases != 0)
   {
       for (int i = 0; i < cases; i++)
       {
            cin >> roman;
            suma += num_roman(roman);
       }
       cout << "Case ";
       roman_num(cas);
       cout << ": ";
       roman_num(suma);
       cout << endl;
       cas++;
       suma = 0;
   }
}

int num_roman(char numero_R[500])
{
  int numero_A[500];
  int suma = 0,ix;

  for(ix = 0;ix < 500;ix++)
    numero_A[ix] = 0;

  for (ix = 0;ix < strlen(numero_R);ix++)
  {
    switch(numero_R[ix])
    {
      case 'I': numero_A[ix] = 1; break;
      case 'V': numero_A[ix] = 5; break;
      case 'X': numero_A[ix] = 10; break;
      case 'L': numero_A[ix] = 50; break;
      case 'C': numero_A[ix] = 100; break;
      case 'D': numero_A[ix] = 500; break;
      case 'M': numero_A[ix] = 1000; break;
      default:
      {
        return (-1); break;
      }
    }
  }

  for(ix = 0;ix < strlen(numero_R);ix++)
  {
    if(numero_A[ix] < numero_A[ix+1])
      suma -= numero_A[ix];
    else
      suma += numero_A[ix];
  }

  return (suma);
}

void roman_num(int num)
{
    int entero,res;
    /* Dividimos por 1000 */
    entero = num/1000;
    res = num%1000;
    switch( entero )
    {
        case 1: printf( "M" ); break;
        case 2: printf( "MM" ); break;
        case 3: printf( "MMM" ); break;
        case 4: printf( "MMMM" ); break;
        case 5: printf( "MMMMM" ); break;
    }
    /* Dividimos por 100 */
    entero = res/100;
    res = res%100;
    switch( entero )
    {
        case 1: printf( "C" ); break;
        case 2: printf( "CC" ); break;
        case 3: printf( "CCC" ); break;
        case 4: printf( "CD" ); break;
        case 5: printf( "D" ); break;
        case 6: printf( "DC" ); break;
        case 7: printf( "DCC" ); break;
        case 8: printf( "DCCC" ); break;
        case 9: printf( "CM" ); break;
    }
    /*Dividimos por 10 */
    entero = res/10;
    res=res%10;
    switch( entero )
    {
        case 1: printf( "X" ); break;
        case 2: printf( "XX" ); break;
        case 3: printf( "XXX" ); break;
        case 4: printf( "XL" ); break;
        case 5: printf( "L" ); break;
        case 6: printf( "LX" ); break;
        case 7: printf( "LXX" ); break;
        case 8: printf( "LXXX" ); break;
        case 9: printf( "XC" ); break;
    }
    switch( res )
    {
        case 1: printf( "I" ); break;
        case 2: printf( "II" ); break;
        case 3: printf( "III" ); break;
        case 4: printf( "IV" ); break;
        case 5: printf( "V" ); break;
        case 6: printf( "VI" ); break;
        case 7: printf( "VII" ); break;
        case 8: printf( "VIII" ); break;
        case 9: printf( "IX" ); break;
     }
}