help

#include <iostream>
#include <string>

#define STACKSIZE 20

using namespace std;

class Stack{

    int totalSize;
    int top;
    int * array;

    public:
    void push(int a);
    int pop();
    Stack(int size);
    ~Stack();
    bool isEmpty();
    bool isFull();
    int getSize();

};

Stack::Stack(int size){
    this->totalSize = size;
    this->top = 0;
    this->array = new int[this->totalSize]; //create the dynamic array
}

Stack::~Stack(){
    free(this-> array);
}

bool Stack:: isEmpty(){
    return this->top == false;

}
bool Stack:: isFull(){
    return this->top == this->totalSize -1;//-1
}


void Stack::push(int element){
    if(isFull()){
        this->array = (int*)malloc(sizeof(int)* this->totalSize * 2);
        this->totalSize *= 2;
    } else{
        this->array[this->top] = element;
        this->top++;
        }
}

int Stack:: pop(){
    if(isEmpty()){
        cout << "Stack is empty" << endl;
        abort();
    }
    else{
        this->top--;
        return this->array[this->top];
    }
}


int main(int argc, char const *argv[])
{
    Stack * newStack = new Stack(STACKSIZE);

    Stack newStack

    newStack->push(5);
    newStack->push(3);
    newStack->push(15);

   // cout <<"Size of the stack: "; this->totalSize << endl;// chce tu sprawdzic czy sie tablica powiekszyłaXD

    newStack->push(35);
    newStack->push(45);
   // cout <<"Size of the stack: ", newStack->totalSize << endl;

    cout<< newStack->pop() << endl;

    return 0;
}