#include <stdio.h>
#include <stdlib.h>

// Demonstrate pointer arithmetic and accessing elements of arrays.
void array_demo1() {
    short i;
	int *x = malloc(sizeof(int) * 6); // 
	int *a, y; // type of a is int*, type of y is int
	printf( "size of a is %lu, size of y is %lu\n", sizeof(a), sizeof(y) );
	
    for (i = 0; i < 6; i++) {
        x[i] = i*10;
    }
    
    // pointer arithmetic
    // a + 1 is bytes beyond a because a is a pointer to ints and ints
    // are 4 bytes. This is a little on the complicated side until you
    // look at it like this: a[i] is equivalent to *(a+i), which means
    // go i elements beyond the beginning of the array and dereference
    // it.
    for (i = 0; i < 6; i++) {
        printf( "a[i] is at %p = %p\n", &(a[i]), a+i );
    }
}
	
int main (int argc, char *argv[]) {
    array_demo1();
}