I am getting the error: "expected '}' at end of input" even though all the brackets are closed.

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C++

I have a Queue class and then a menu driven main function. There are only 3 opening brackets in the main function, and there are three to match them. So I am not sure why I am getting this error. Below is the code:

#include <stdio.h>
#include <iostream>
#include <vector>

using namespace std;

class Queue {
private:
    int R;
    int F;
    vector<int> A{vector<int>(5,0)};
public:
    //Constructor
    Queue() {
    R=-1;
    F=-1;
    
        for (int i = 0; i < A.size();i++) {
            A[i] = 0;
        }
    }

    bool isEmpty(){
        if (R== -1 && F==-1) {
            return true;
        }
        else {
            return false;
        }
    }
    
    bool isFull(){
        if (R==A.size()-1) {
            return true;
        }
        else {
            return false;
        }
    }
    
    void enqueue(int val) {
        if (isFull() {
            cout << "Queue Full!";
            //return;
        }
        else if (isEmpty()){
            F=R=0;
            A[R] = val;
        }
        else {
            R++;
            A[R] = val;
        }
    }
    
    int dequeue(int val) {
        int x{0};
        if (isEmpty) {
            cout << "Queue is empty!";
            //return;
        }
        else if (F=R){
            x = A[F];
            A[F] = 0;
            F=R=-1;
        }
        else {
            x = A[F];
            A[F] = 0;
            F++;
        }
        return x;
    }
    
    int count() {
        if (isEmpty()) {
            return 0;
        }
        else {
            return R-F+1;
        }
    }
    
    void display() {
        for (int i = F; i <= R;i++) {
            cout << A[i] << " ";
        }
    }
};

int main(int argc, char **argv)
{
	Queue q1;
  int value, option;

  do {
    cout << "\n\nWhat operation do you want to perform? Select Option number. Enter 0 to exit." << endl;
    cout << "1. Enqueue()" << endl;
    cout << "2. Dequeue()" << endl;
    cout << "3. isEmpty()" << endl;
    cout << "4. isFull()" << endl;
    cout << "5. count()" << endl;
    cout << "6. display()" << endl;
    cout << "7. Clear Screen" << endl << endl;

    cin >> option;

    switch (option) {
    case 0:
      break;
    case 1:
      cout << "Enqueue Operation \nEnter an item to Enqueue in the Queue" << endl;
      cin >> value;
      q1.enqueue(value);
      break;
    case 2:
      cout << "Dequeue Operation \nDequeued Value : " << q1.dequeue() << endl;
      break;
    case 3:
      if (q1.isEmpty())
        cout << "Queue is Empty" << endl;
      else
        cout << "Queue is not Empty" << endl;
      break;
    case 4:
      if (q1.isFull())
        cout << "Queue is Full" << endl;
      else
        cout << "Queue is not Full" << endl;
      break;
    case 5:
      cout << "Count Operation \nCount of items in Queue : " << q1.count() << endl;
      break;
    case 6:
      cout << "Display Function Called - " << endl;
      q1.display();
      break;
    case 7:
      system("cls");
      break;
    default:
      cout << "Enter Proper Option number " << endl;
    }

  } while (option != 0);

return 0;
}

What I have tried:

I checked all the brackets to see if I am missing any closing brackets.