How to swap integer type array values without using system defined function and minimal iteration

/* Function to reverse arr[] from start to end*/

void rvereseArray(int arr[], int start, int end)

{

    int temp;

    while (start < end)

    {

        temp = arr[start];  

        arr[start] = arr[end];

        arr[end] = temp;

        start++;

        end--;

    }  

}  







 

/* Function to reverse arr[] from start to end*/

void rvereseArray(int arr[], int start, int end)

{

   int temp;

   if (start >= end)

     return;

   temp = arr[start];  

   arr[start] = arr[end];

   arr[end] = temp;

   rvereseArray(arr, start+1, end-1);  

}