#include <stdlib.h>

// Customer class declaration
// precondition: srand() must be called once before any function methods
// postcondition: arrive(void) returns a random integer between 1 and 15
//              : gallons(void) returns a random integer between 3 and 20

class Customer
{
  public:
     Customer(void) {cout << "\n**** A new customer has arrived ****" << endl;};
    ~Customer(void) {cout << "!!!! The customer has departed !!!!" << endl;};
    int arrive(void) {return(1 + rand() % 16);};
    int gallons(void) {return(3 + rand() % 21);};
};