how to initialize array with new in c 2b 2b

1int* a = NULL;   // Pointer to int, initialize to nothing.
2int n;           // Size needed for array
3cin >> n;        // Read in the size
4a = new int[n];  // Allocate n ints and save ptr in a.
5for (int i=0; i<n; i++) {
6    a[i] = 0;    // Initialize all elements to zero.
7}
8. . .  // Use a as a normal array
9delete [] a;  // When done, free memory pointed to by a.
10a = NULL;     // Clear a to prevent using invalid memory reference.
11

1int nCount[] = {1, 2, 3, 4, 5};

1int arr[3] = {1, 5, 4};