creating dynamic arrays

arrayPractice_02.cpp

#include <iostream>

// ================================================== Prototypes ======================================================= //

void get(int* (&), int&);  // function prototypes
void print(int*, int);

// ================================================== Source ========================================================== //

int main()
{
    std::cout <<"\n=======================   dynamicArrays.cpp ===========================\n";

    int* aptr;                 // aptr is simply an unallocated pointer
    int n;
    int numberOfArrays;

    std::cout << "\nEnter the number of dynamic arrays to create: ";
    std::cin >> numberOfArrays;
    std::cout << std::endl;

    // note: int* aptr == int aptr[]

    // loop through numberOfArrays to create
    for (int i = 0; i < numberOfArrays; ++i)
    {
        get(aptr, n);          // repopulate arrays with n ints
        print(aptr, n);

        delete[] aptr;         // deallocate memory    
        aptr = nullptr;        // empty aptr
    }
}

// ================================================== Definitions ====================================================== //

void get(int* &myArrayPtr, int& myArraySize)
{
    // pass myArrayPtr as reference to int pointer; changes to parameter myArrayPtr (passed as aptr) here, will be seen in main; parenthesis are only for clarity
    std::cout << "Enter number of elements: ";
    std::cin >> myArraySize;
    myArrayPtr = new int[myArraySize]; // heap memory

    std::cout << "Enter " << myArraySize << " items, one per line:\n";
    for (int i = 0; i < myArraySize; i++)
    {
        std::cout << i + 1 << ": ";
        std::cin >> myArrayPtr[i];
    }
}

void print(int* print_myArrayPtr, int z) // int* myArrayPtr == int myArrayPtr[]
{
    std::cout << "\nThe elements of the array are: ";

    for (int i = 0; i < z; i++)
    {
        // note for this loop: myArrayPtr[i] = *(myArrayPtr + i)
        std::cout << *(print_myArrayPtr + i) << " ";
    }
    std::cout << std::endl << std::endl;
}

practice dynamic array creation