//multidimarrays.cpp
//The standard way to declare a 2-dimensional array:
//     float x[3][5];  //a 3 by 5 array of floats called x
//     x[2][4]=3.14;  //assigning to an element
//Problems arise when we try to
//     create a new 2-dimensional array on the freestore
//Awkward for parameters, making higher dimensional arrays.
//Can't be used for return type for assignment of one array to another.

#include<iostream>
#include<cstdlib>
using namespace std;

const int  NUM_MONTHS=12;
const int NUM_THEATERS=5;

typedef int CustType[NUM_THEATERS][NUM_MONTHS];
  //create a type called CustType which is a 2 dimensional array.
  //type can be used for new, for parameter, for making higher dimensional arrays,
  //doesn't help with return type or assignment
  
enum Theaters {Shoppingtown, Carousel, Manlius, Westcott, Hollywood};

void ObtainData(CustType c)  //parameter is a two dimensional array
    {
    int theater;
    int month;
    //working down columns this time
    for (month=0; month<NUM_MONTHS; month++)
        for (theater=0; theater<NUM_THEATERS; theater++)
            c[theater][month]=rand()%10000;
    return;
    }
    
//CustType f(CustType x)  //array type as return type
//    {return x;}
//  try it.
      
int main()
    {
    CustType customers_served;  //array of number of customers served at each theater each month
    ObtainData(customers_served);
    
    //compute total number of customers for March
    int i;
    int sum=0;
    for (i=0; i<NUM_THEATERS; i++)
        sum=sum + customers_served[i][2];
    cout << "During March " << sum << " customers were served by the " 
        << NUM_THEATERS << " theaters." << endl;
        
    CustType* pserved = new CustType[4];  //4 years worth of data
      //pserved works like a 3-dimensional array
      //[year][theater number][month]
    for (i=0;i<4; i++)
        ObtainData(pserved[i]); 
    
    //Print out  totals for each year for Westcott;
    int year;
    int month;
    
    for (year=0; year<4; year++)   
        {
        sum=0;  //reset the sum for each year
        for (month=0; month<NUM_MONTHS; month++)
            sum=sum+pserved[year][Westcott][month];
        cout << "During year " << year << " Westcott had " << sum <<" customers." << endl;
        }
    
    //another experiment with typedef
    //CustType x;
    //x=customers_served;  //illegal
    
    return 0;
    }