#include <iostream>

using namespace std;

const int STEP_SIZE = 10;

void FillArray(int * ary, size_t &  size);
void PrintArray(const int * ary, size_t size);
void GrowArray(int * & ary, size_t & size);

int main() {
    
     size_t size;
     int * data=nullptr;
     data = new int[STEP_SIZE];

     FillArray(data, size);

     cout << "The initial array" << endl;
     PrintArray(data, size);
     cout << endl;

     cout << "The array after growing" << endl;
     GrowArray(data, size);
     PrintArray(data, size);
     cout << endl;

     delete [] data;

     return 0;
}

void FillArray(int * ary, size_t  & size){
     size_t i;

     size = STEP_SIZE;

     for(i=0;i<size; i++) {
         ary[i] = 10+i;
     }

     return;
}

// void PrintArray(int ary[], size_t size);
void PrintArray(const int * ary, size_t size){
     size_t i;

     for(i=0;i<size;i++) {
        cout << ary[i] << endl;
     }
     return;
}

// GrowArray
// 1. Allocate new memory for the larger array
// 2. Copy the original array to the new memory
// 3. Dispose of the old memory
// 4. Change the pointers to point to the new memory.
// 5. Change the array size
void GrowArray(int * & ary, size_t & size){
     size_t i;

     int * tmp = nullptr;
     tmp = new int[size+10];

     for(i=0;i<size;i++) {
         tmp[i] = ary[i];
     }

     delete [] ary;

     ary = tmp;
     tmp = nullptr;

     for(i=size; i < size+10; i++) {
         ary[i] = 10+i;
     }

     size += 10;

     return;
}


// open the file
// read the first data into tmp
// while not at the end of the file
//     act on the data
//     read new data into tmp