/* a pointer to an array, and pointer arithmetic */

#include<stdio.h>

int main()
{

	int i, length;
	int a[10];
	int *ptr;

	/* give each element a value */
	for (i=0; i<10; i++)
		a[i] = i + 100;

	/* point the pointer at the last array element */
	ptr = &a[9];

	/* find the number of elements between the first
	and last elements in the array */
	length = ptr - a;

	printf("Pointer ptr: %u, a: %u\n", ptr, a);
	printf("The array is %d elements long\n", length);
}