Array order reversal without using second array

/*   Array order reversal without using second array */

#include<stdio.h>

void main()

{

   int arr[50], i, j, num, temp;

  clrscr();

   printf("\n Enter number of elements  to be entered to the array: ");

   scanf("%d", &num);

   printf("Enter %d number of elements into array arr", num);  

   for (i = 0; i < num; i++) {

      scanf("%d", &arr[i]);

   }

    j = i - 1;           

   i = 0;    

 

   while (i < j) {

      temp = arr[i];

      arr[i] = arr[j];

      arr[j] = temp;

      i++;                

      j--;                 

   }

    printf("\n Resultant array after reversal : ");

   for (i = 0; i < num; i++) {

      printf("%d \t", arr[i]);

   }

getch();

 }