What would be the result of multiplying the final capacity to the index corresponding to the item at the top of the stack if the following operations were executed?

I'm having trouble on this bit of code. Please leave notes & comments if possible!! Thank you!

Given the following

class Stack{

private:

string * A;

int count;

int capacity;

Stack::Stack()

{

A = new string[2];

count = 0;

capacity = 2;

}

void Stack::push(string s) {

if (count == capacity) {

string* new_A = new string[2 * capacity];

for (int i = 0; i < capacity; ++i)

new_A[i] = A[i];

delete[] A;

A = new_A;

capacity *= 2;

}

A[count] = s;

++count;

}

void Stack::pop() {

if (count == 0)

return;

--count;

}

What would be the result of multiplying the final capacity to the index corresponding to the item at the top of the stack if the following operations were executed?

int main()

{

Stack s;

s.push("A");

s.push("B");

s.push("C");

s.push("D");

s.pop();

return 0;

}