array basics

#include <iostream>
using namespace std;

void reverseArray(int arr[], int size) {
    int start = 0;
    int end = size - 1;

    while (start < end) {
        // Swap elements at start and end indices
        int temp = arr[start];
        arr[start] = arr[end];
        arr[end] = temp;

        // Move towards the center of the array
        start++;
        end--;
    }
}

int main()
{
    int numbers[5] = { 2,5,8,10,15 };
    int sum = 0;
    int max = 0;
    int input;
    int flag;

    //array size
    int arr = sizeof(numbers) / sizeof(int);
    //cout << arr;

    for (int i = 0; i < arr; i++)
    {
        sum = numbers[i] + sum;
    }
    cout << "Sum of the array is: " <<sum <<"\n";

    cout << "Avg of the array is: " << sum/arr << "\n";
    for (int i = 0; i < arr; i++)
    {
        if (numbers[i] > max)
        {
            max = numbers[i];
        }
    }

    cout << "The max element of the array is: " << max << "\n";

    cout << "Your number is: " << "\n";
    cin >> input;
    for (int i = 0; i <arr; i++)
    {
        if (input == numbers[i])
        {
            flag = 1;
            break;
        }
        else flag = 0;
    }
    if (flag == 1)
    {
        cout << "Your number is in the array!" << "\n";
    }
    else cout << "Your number is not in the array!" << "\n";

    //smqna na 3ti element v masiva i otpechatwane
    for (int i = 0; i <arr; i++)
    {
        if (i == 2)
        {
            numbers[2] = 20;
        }
        cout << numbers[i] << " ";
        cout << "\n";
    }
    reverseArray(numbers, arr);

    // Print the reversed array
    cout << "Reversed Array: ";
    for (int i = 0; i < arr; i++) {
        cout << numbers[i] << " ";
    }
    cout << endl;


}