#include <stdio.h>

int main()
{
	// Pointer Arithmetic
	// The following operations are valid with pointers:
	// ++, --, + (+=), - (-=)

	int nums[10];

	int i;
	// Getting length of nums using sizeof
	int len_sizeof = sizeof(nums) / sizeof(nums[0]);

	for (i = 0; i < len_sizeof; i++)
		nums[i] = i;

	int* ptr = nums;

	for (i = 0; i < len_sizeof; i++, ptr++)
		printf("%d ", *ptr);

	printf("\n");

	// ptr currently points to the end of nums
	// To iterate through the array backwards
	// we can use the decrement operator.
	// NOTE: We have to decrement before
	// derefencing because we are outside of the array
	// and we need to move back into the array
	for (i = 0; i < len_sizeof; i++)
		printf("%d ", *(--ptr));

	printf("\n");

	// We have seen this already. The only difference
	// was we were dereferencing after the addition.
	int* index3 = nums + 3;
	int* index7 = nums + 7;

	printf("The value at nums[3] is %d\n", *index3);
	printf("The value at nums[7] is %d\n", *index7);

	int* ptrBegin = nums;
	int* ptrEnd = nums + len_sizeof;

	// Using pointer subtraction to get the size of the nums array
	int len_ptrSubtract = ptrEnd - ptrBegin;

	printf("nums contains %d ints\n", len_ptrSubtract);
}