hello world.c

void _log(int);

void log123() {
  _log(123);
}

pointer arithmetic.c

#include <stdio.h>

int main() {
  short arr[] = {1, 2, 3};

  printf("Address of arr    - %p\n", &arr);
  printf("Address of arr[0] - %p\n", &arr[0]);
  printf("Address of arr[1] - %p\n", &arr[1]);

  /*
    | address | size |
    |---------|------|
    | arr     | 8    |
    | arr[0]  | 4    |
    | arr[1]  | 4    |
  */

  printf("----\n");

  printf("Address of arr[0] - %p\n", &arr[0]);
  printf("Value of arr[0]   - %d\n", *(&arr[0]));

  printf("----\n");

  printf("Address of arr[1] - %p\n", &arr[0] + 1);
  printf("Value of arr[1]   - %d\n", *(&arr[0] + 1));

  printf("----\n");

  printf("Next memory block      - %p - difference with &arr = %d\n", &arr + 1, sizeof(arr));
  printf("Real next memory block - %p - difference with &arr = 1\n", (void *)&arr + 1);

  printf("----\n");

  /*
    When adding an integer `i` to an address of type `T`, say `0xfffffffff000`,
    the resultant is not `0xfffffffff000 + i`,
    but rather `0xfffffffff000 + (i * sizeof(T))`
  */
  printf("Proof 1 - %d\n", (void *)&arr + sizeof(arr)    == &arr    + 1);
  printf("Proof 2 - %d\n", (void *)&arr + sizeof(arr[0]) == &arr[0] + 1);

  return 0;
}

program.wasm