types

int main() {
    printf("sizeof(char)=%lu\n", sizeof(char));
    printf("sizeof(int)=%lu\n", sizeof(int));
    printf("sizeof(float)=%lu\n", sizeof(float));
    printf("sizeof(double)=%lu\n", sizeof(double));
}

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associativity

int main() {
    int a = 0, b = 1, c = 5;
    a=b==c;
    printf("%d\n", a);
}

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a pointer and a pointer of a pointer

int main() {
    char val = 'a';
    char *ptr = &val;
    char **ptrptr = &ptr;

    printf(" val=%c\n ptr=%p    => *ptr=%c\n ptrptr=%p => *ptrptr=%p => **ptrptr=%c\n",
            val, ptr, *ptr, ptrptr, *ptrptr, **ptrptr);
}

---
pointer arithmatic


int main() {
  char *c = (char *)0x1000;
  int  *i = (int *) 0x1000;

  printf("%p %p\n", (c+1), (i+1));

  return 0;
}

---