In C programming language, 2 Ways to swap array elements using temp variable

swap_array_elts.c

#include <stdio.h>
void swap(int *x, int *y) {
    int t = *x;
    *x = *y;
    *y = t;
}

int main()
{
    int arr[5] = {1, 2, 3, 4, 5};
    // Swap elts at index 0 and 4

    swap(arr, arr+4);
    println("%d\n%d", arr[0], arr[4]);

    swap(&arr[0], &arr[4]);
    println("%d\n%d", arr[0], arr[4]);

    return 0;
}

/* Expected output
5
1
1
5
*/