我怎么能阻止我的整数显示为十六进制

我正在练习一些实现不同数据结构的代码。对于这个例子，我试图实现一个简单的堆栈数据结构。到目前为止，它按预期工作，但我不断得到十六进制字符时，试图显示我的堆栈。有人能帮我弄清楚为什么会这样吗?

我也在努力更好地组织我的代码，任何已经参与这个行业的人都可以给我一些建设性的批评，关于我到目前为止所写的代码。谢谢。

#include <iostream>
using namespace std;
// stack_MAX == maximum height of stack
const int stack_MAX = 10;
class stack{
    public:
        stack(){
        //Constructor initializes top of stack
            top = -1;
        }
        bool isFull(int top){
        //isFull() will check to make sure stack is not full
        //Will return TRUE if stack is FULL, and FALSE if 
        //stack is NOT FULL
            if(top == stack_MAX - 1)
                return true;
            else
                return false;
        }
        bool isEmpty(int top){
        //isEmpty() will check to make sure stack is not empty
        //Will return TRUE if stack is EMPTY, and FALSE if
        //stack is NOT EMPTY
            if(top == -1)
                return true;
            else
                return false;
        }
        void push(int x){
        //push() will push new element on top of stack
            if(isFull(top)){
                cout << "Sorry, but the stack is full!" << endl;
                exit(1);
            }
            else{
                top++;
                x = stk[top];
            }
        }
        void pop(){
        //pop() will pop the top element from the stack
            if(isEmpty(top)){
                cout << "Sorry, but the stack is empty!" << endl;
                exit(1);
            }
            else{
                cout << stk[top] << " is being popped from stack!" << endl;
                top--;
            }
        }
        void display_stack(){
        //diplay_stack() will show all elements currently in the stack
            int temp;   //will temporarily hold position of stack
            temp = top;
            while(!isEmpty(temp)){
                cout << stk[temp] << endl;
                temp--;
            }
        }
    private:
        int top;
        int stk[stack_MAX];
};
int menu(){
    int choice;
    cout << "Welcome to my stack!" << endl;
    cout << "What would you like to do? (select corresponding #)" << endl << endl;
    cout << "1. Push" << endl;
    cout << "2. Pop" << endl;
    cout << "3. Display" << endl;
    cout << "4. Quit" << endl;
    cin >> choice;
    return choice;
}
int main()
{
    int selection, x;
    stack myStack;
    selection = menu();
    while(selection != 4)
    {
        switch(selection){
            case 1:
                cout << "please enter number to be pushed: ";
                cin >> x;
                myStack.push(x);
                selection = menu();
                break;
            case 2:
                myStack.pop();
                selection = menu();
                break;
            case 3:
                myStack.display_stack();
                selection = menu();
                break;
            default:
                cout << "Oops that's not a selection, try again" << endl;
                selection = menu();
                break;
        }
    }
    cout << "Thank you for stopping by and using my stack!" << endl;
    system("pause");
    return 0;
}