#include	<stdio.h>

int
main()
{
	int	 i = 0, j = 2;
	int	*ptr = &i;

	/* *ptr is an alias for i */
	printf("Before i = %d\t*ptr = %d\n", i, *ptr);
	*ptr = 1;
	printf("After i = %d\t*ptr = %d\n", i, *ptr);

	ptr = &j;
	/* Now *ptr is an alias for j */
	printf("Before j = %d\t*ptr = %d\n", j, *ptr);
	j = *ptr * 2;
	printf("After j = %d\t*ptr = %d\n", j, *ptr);
	return 0;
}