DSA- Reverse an array

input array arr[] = {10, 20, 30, 50, 15, 16};

Expected output: 16 15 50 30 20 10

#include <bits/stdc++.h>
#include <iostream>
#include <math.h>
#include <string>
using namespace std;

int main() {

  //reverse an array
  //int arr[] = {10, 20, 30, 50, 15, 16}; // even input
  int arr[] = {10, 20, 30, 50, 15};//odd input
  int arrLength = sizeof(arr) / sizeof(int);
  int start = 0;
  int end = arrLength - 1;
  int swapHolder;
  while (start < end) {
    swapHolder = arr[end];
    arr[end] = arr[start];
    arr[start] = swapHolder;
    start++;
    end--;
  }
  for (int i = 0; i < arrLength; i++) {
    cout << arr[i] << " ";
  }
}