Soda Dispenser - No functions and I didn't make an array ;D!

soda_dispenser.cpp

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

#define NUMBER_OF_OPTIONS 3
#define NUMBER_OF_ARGS NUMBER_OF_OPTIONS*2

using namespace std;

int main(int argc, char** argv)
{
  int counter=1;

  if(argc == 1)
  {
    // If you don't want to use arrays, provide your own data.
    char* newargv[] = {"3", "Dr. Pepper", "1", "Pepsi", "2", "SQRT Beer"};
    argc = NUMBER_OF_ARGS;
    argv = newargv;
  }
  else if(argc % 2)
  {
    cerr << "Must have an even number of arguments." << endl;
    return 0;
  }

  cout << "Choose a drink to vend:" << endl;
  int choice = 255;

  for(int i=0; i<argc; i+=2)
  {
    if(atoi(argv[i]) == 0)
      continue;

    cout << "  " << counter << ") " << argv[i+1] << " (" << argv[i] << " left)" << endl;
    counter++;
  }

  if(counter == 1) // we never printed a menu item
  {
    cout << "  OUT OF ORDER: EMPTY" << endl;
    return 0;
  }

  cout << "  " << counter << ") Exit" << endl << endl;
  cout << "Choice: ";
  cin >> choice;

  if(choice == counter)
  {
    cout << "Thank you! Please come again!" << endl;
    return 0;
  }

  if(choice > counter || choice == 0)
    return main(argc, argv);

  choice -= 1;
  // Finally, actually do something since it's a valid choice
  for(int i=0; i<=choice; i++)
  {
    if(atoi(argv[i*2]) == 0)
    {
      choice++;
      continue;
    }
  }

  char new_value[8];
  sprintf(new_value, "%u", atoi(argv[choice*2]) - 1);
  argv[choice*2] = new_value;

  cout << "A cool " << argv[choice*2+1] << " falls down into the collection chute." << endl;

  return main(argc, argv);
}