Check out example codes for "how to dynamically allocate an array c++". It will help you in understanding the concepts better.

Code Example 1

int* a = NULL;   // Pointer to int, initialize to nothing.
int n;           // Size needed for array
cin >> n;        // Read in the size
a = new int[n];  // Allocate n ints and save ptr in a.
for (int i=0; i<n; i++) {
    a[i] = 0;    // Initialize all elements to zero.
. . .  // Use a as a normal array
delete [] a;  // When done, free memory pointed to by a.
a = NULL;     // Clear a to prevent using invalid memory reference.

Code Example 2

int main()
  int size;

  std::cin >> size;

  int *array = new int[size];

  delete [] array;

  return 0;

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