How do i...solve this ?

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C++

#include "Queue.h"
#include<stack>
#include<iostream>
using namespace std;
int main() {

	int number;
	int size;
	cout << "Enter size of queue"; 
	cin >> size;
	Queue q1(size);
	stack<int>stk;

	for (int i = 0; i < size; i++) {
		cout << "Enter series of number \n";
		cin >> number;
		q1.enque(number);
		stk.push(number);
	}

	cout << "The correct order is \n";
	q1.display();
	cout << "The reversed order is ";
	while (stk.empty()==false) {
       stk.top();
		stk.pop();
	}

	return 0;
}


void Queue::display() {
	cout << "All value of queue are";
	if (!isEmpty()) {
		for (int i = front; i <= rear;i++) {
			cout << arr[i];

		}
		cout << endl;
	}
}

What I have tried:

I have a problem in display function as it print out garbage value I do not know why??
for instance it is queue implementation I have implemeneted it using array in class with header and cpp file but I have uploaded the code of the main and display fucntion
I have copied code of display function from cpp file just for view
If anyone know a solution it will be apperciated.