C++用数组模拟stack的实现时报错求解决

我自己写了一个模拟栈的程序，是用数组实现的。
程序能够运行并能正常显示，但却在最后的system("pause")报错，求大神帮帮忙。
代码如下：

class Stack {
public:
    int* arrays = new int[_capacity];
    Stack() {
        for (int i = 0; i < _capacity;i++)
        {
            arrays[i] = 0;
        }
    };
    void push_back(int value) {
        index++;
        if (index>=_capacity)
        {
            int* newarray = new int[_capacity + 5];
            for (int i = 0; i++; i < _capacity)
            {

                newarray[i] = arrays[i];
            }
            delete[]arrays;
            arrays = nullptr;
            arrays = newarray;
            delete[]newarray;
            newarray = nullptr;
            _capacity += 5;
            setDefault(length);
        }
        arrays[index] = value;
        length++;
    }
    void print() {
        for (int i = 0; i < _capacity; i++)
        {
            cout << arrays[i] << "";
        }
    }
    void pop_back() {
        if (index >= 0)
        {
            arrays[index] = 0;
            index--;
            length--;
        }
    }
    int size() {
        return length;
    }
    int capacity() {
        return _capacity;
    }
private:
    int index = -1;
    int length = 0;
    int _capacity = 10;
    void setDefault(int startIndex) {
        for (int i = startIndex; i < _capacity; i++)
        {
            arrays[i] = 0;
        }
    }
};
int main(){

    Stack* stack = new Stack();
    stack->push_back(56);
    stack->print();
    cout << endl;
    stack->push_back(39);
    stack->print();
    cout << endl;
    stack->pop_back();
    stack->print();
    cout << endl;
    system("pause");//当我按下任意一个键时这里出现了问题
}
![图片说明](https://img-ask.csdn.net/upload/201908/15/1565848929_171163.jpg)

这该怎么办呢，求大神解决，!
谢谢！

把array的初始化操作放到构造函数中

int* arrays;
    Stack() {
        arrays = new int[_capacity];
        for (int i = 0; i < _capacity; i++)
        {
            arrays[i] = 0;
        }
    };