C++ Array Stores twelve months of sales and prints selected ones.

#include <iostream>
using namespace std;
#include <ctype.h>
#include <conio.h>
#include <iomanip.h>
const int NUM = 12;
void main()/*from   w  w w  .java  2 s  .  c o  m*/
{
   float sales[NUM];
   int ctr, ans;
   int req_month;                 // Holds user's request.
   // Fill the array.
   cout << "Please enter the twelve monthly sales values\n";
   for (ctr=0; ctr<NUM; ctr++)
   {
      cout << "What are sales for month number " << ctr+1 << "? \n";
      cin >> sales[ctr];
   }
   cout << "Prints any sales from the last " << NUM << " months\n\n";
   do
   {
      cout << "For what month (1-" << NUM << ") do you want " << "to see a sales value? ";
      cin >> req_month;

      cout << "\nMonth " 
           << req_month 
           << "'s sales are " 
           << setprecision(2) 
           << sales[req_month-1];
           
      cout << "\nDo you want to see another (Y/N)? ";
      ans=getch();
      ans=toupper(ans);
   } while (ans == 'Y');
   return;
}