I am trying to write a recursive function that has three arguments; an array and two array indexes. The function should reverse the order of the values between the two indexes. I would like to understand what is happening instead of just being told an answer.

Here is my code so far:

#include <iostream>
using namespace std;

char switchAroo(char a[], int b1, int b2);

int main()
{
    char a[6] {'A', 'B', 'C', 'D', 'E', '\0'};
    cout << a;
    switchAroo(a, 2, 5);

    return 0;
}

char switchAroo(char a [], int b1, int b2)
{
    char temp;
    if (b1 == b2)
        cout << "The array after switchAroo is " << a << endl;
    else
    {
        temp = a[b1];
        a[b1] = a[b2];
        a[b2] = temp;
        b1++;
        b2--;
        return switchAroo(a, b1, b2);
    }
}

I am getting the following warning code:

warning C4715: 'switchAroo' : not all control paths return a value

Any help would be greatly appreciated.