C Program to reverse the elements of an array

/**********************************************
 Program to reverse the elements of an array 
 **********************************************/

#include<stdio.h> // include stdio.h library
#define MAX 5

int main(void)
{    
    int arr[MAX] = {10, 20, 30, 40, 50},
            i, j, tmp;

    i = 0;
    j = MAX - 1; // assign the last valid index 

    while(i < j)
    {
        // swap the elements
        tmp = arr[i];
        arr[i] = arr[j];
        arr[j] = tmp; 

        i++;  
        j--;
    }

    //  print the reversed array
    for(int k = 0; k < MAX; k++)
    {
        printf("%d ", arr[k]);
    }

    return 0; // return 0 to operating system
}