reverse a in c++ code example

Example 1: reverse an array in cpp

#include<iostream>
using namespace std;
int main()
{   
     int n=3;
     int arr[]={1,2,3,4};
      while (n>=0)
    {
        cout<<arr[n];
        n--;
      }
         
    return 0;
}

Example 2: reverse c++

reverse(str.begin(),str.end());