// Public domain / CC0. Use freely for any purpose. RoyR 2026
// pointers.cm - Pointer operations
// Demonstrates: pointers, pointer arithmetic, dereferencing

void printf(uint8 *fmt);

void swap(int32 *a, int32 *b) {
    int32 temp = *a;
    *a = *b;
    *b = temp;
}

int32 main(void) {
    int32 x = 42;
    int32 y = 17;
    
    printf("Before swap: x=%d, y=%d\n", x, y);
    swap(&x, &y);
    printf("After swap:  x=%d, y=%d\n", x, y);
    
    // Pointer arithmetic with arrays
    int32 arr[5] = { 10, 20, 30, 40, 50 };
    int32 *ptr = arr;
    
    printf("\nArray traversal with pointer arithmetic:\n");
    for (int32 i = 0; i < 5; i = i + 1) {
        printf("arr[%d] = %d (via pointer: %d)\n", i, arr[i], *(ptr + i));
    }
    
    // Pointer to pointer
    int32 value = 99;
    int32 *p1 = &value;
    int32 **p2 = &p1;
    
    printf("\nPointer to pointer: **p2 = %d\n", **p2);
    
    return 0;
}