/*
 * Pointer demo - a la Binky
 * CSE 413 demo 10/15 rea
 */

#include <stdio.h>

int main() {   
    int*    x;  // Allocate the pointers x and y
    int*    y;  // (but not the pointees)
    int z;

    x = malloc(sizeof(int));    // Allocate an int pointee,
                                // and set x to point to it
    
    *x = 42;    // Dereference x to store 42 in its pointee
    printf("Assign x to 42\n");
    
    *y = 13;    // CRASH (??) -- y does not have a pointee yet
    z = 45;

    printf ("x = %d y = %d z = %d\n", x, y, z);
    printf ("x = %p y = %p z = %p\n", x, y, z);
    printf ("*x = %d *y = %d\n", *x, *y);

    y = x;      // Pointer assignment sets y to point to x's pointee
    *y = 13;    // Dereference y to store 13 in its (shared) pointee

    y = &z;
    printf ("x = %d y = %d z = %d\n", x, y, z);

    *y = 16;

    printf ("*x = %d *y = %d\n", *x, *y);
    printf ("x = %d y = %d z = %d\n", x, y, z);

  return 0;
}