#include <stdio.h>

int main()
{
	int i, j, *p, *q;

	printf("Assigning constant to a pointer\n");
	p = 30564378;	// warning, may result in segmentation fault
	printf("%u\n", p);
	//printf("%d\n", (*p));	// may result in segmentation fault

	printf("Assigning NULL to a pointer\n");
	p = NULL;
	printf("%u\n", p);
	//printf("%d\n", (*p));	// error

	printf("Printing a pointer\n");
	p = &i;
	printf("%u\n", p);

	printf("Incrementing a pointer\n");
	p++;
	printf("%u\t%u\n", p, (p - 3));

	printf("Printing a pointer\n");
	q = &j;
	printf("%u\n", q);

	//p = p * 2;	// error
	//q = q / p;	// error

	printf("Comparing two pointers\n");
	printf("%d\t%d\n", (p < q), (p > q));

	printf("Assigning address to pointers\n");
	p = &i;
	*p = 3;
	q = &j;
	*q = 9;
	printf("%u\t%u\t%d\t%d\t%d\t%d\n", p, q, (*p), (*q), i, j);

	printf("Assigning a pointer to another pointer\n");
	p = q;
	printf("%u\t%u\t%d\t%d\n", p, q, (*p), (*q));

	*p = 4;
	printf("%u\t%u\t%d\t%d\n", p, q, (*p), (*q));

	printf("Subtracting a pointer from another pointer\n");
	p = q + 3;
	printf("%u\t%u\t%d\t%d\n", p, q, (p - q), (q - p));

	printf("Incrementing the content of a pointer\n");
	printf("%d\t%d\t%d\n", (*p), (*(p + 1)), (*p + 1));
}