Why my program does not run properly(reverse an array)

#include <iostream>
using namespace std;

void reverseArray(string arr[]) //can writhe length parameter also
{
    int j=0;
    string revArray[arr->length()];
    for(int i=arr->length(); i>0; i--)
    {

        revArray[j]=arr[i];
        j++;
    }
    for(int i=0; i<revArray->length(); i++)
    {
        cout<<revArray[i]<<endl;
    }
}

int main()
{
    string arr[5]={"Audi"};
    reverseArray(arr);
}