Peculiar C snippets - taken from this [Advanced C presentation](https://youtu.be/w3_e9vZj7D8)

test.c

// Compiler explorer: https://godbolt.org/z/dnjeMhzv1

#include <stdio.h>

void array_index() {
  int x = 3;
  int a[5];
  a[x] = 0;
  if (x >= 5)
    printf("Hello world\n");
}

void zero_division() {
  int a = 1, x = 2;
  a /= x;
  if (x == 0)
    printf("Hello world\n");
}

void bitshift() {
  int a = 1, x = 2;
  a <<= x;
  if (x >= 32)
    print("Hello world\n");
}

void deref_zero() {
  int *x = malloc(1);
  *x = 0;
  if (x == NULL)
     printf("Hello world\n");
}

void deref_zero1() {
  int *x = malloc(1);
  if (x == NULL)
     printf("Hello world\n");
  *x = 0;
}

void aliasing() {
  int a, b, *p;
  p = &a;
  p++;
  if (p == &b)
    printf("%p == %p", p, &b);
  else
    printf("%p != %p", p, &b);
}

int main() {
    return 0;
}