Program of Binary Search in C

#include <stdio.h>
void binary_search();
int a[50], n, item, loc, beg, mid, end, i;
main()
{
           printf(" Enter size of an array: ");
           scanf("%d", &n);

           printf(" Enter elements of an array in sorted form: ");

           for(i=0; i<n; i++)
           scanf("%d", &a[i]);

           printf(" Enter ITEM to be searched: ");
           scanf("%d", &item);
 
           binary_search();

getch();
}

void binary_search()
{
           beg = 0; end = n-1;
           mid = (beg + end) / 2;

           while ((beg<=end) && (a[mid]!=item))
           {
                      if (item < a[mid])
                      end = mid - 1;
                      else
                      beg = mid + 1;
                      mid = (beg + end) / 2;
           }

if (a[mid] == item)

           printf(" ITEM found at location %d", mid+1);

else

           printf(" ITEM doesn't exist");
}