Unexpected places you can and can’t use null bytes(eklitzke.org)

    $ cat pointers.c 
    #include "stdio.h"

    int main(int argc, char* argv[]) {
     char Z = 'Z';
     char q = 'q';
     void* null = 0;

     printf("Z is \\x%02x\n", Z);
     printf("But if it were a pointer, it would be %08x\n", Z);
     printf("Watch this:\n\n");

     null = Z;

     /* %p to print a pointer value */
     printf("Our void* is now: %p\n", null);

     q = null;

     printf("And q is: %c\n", q);

     return 0;
    }
    $ gcc -o pointers pointers.c
    pointers.c: In function ‘main’:
    pointers.c:12:7: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
      null = Z;
           ^
    pointers.c:17:4: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
      q = null;
        ^
    $ ./pointers
    Z is \x5a
    But if it were a pointer, it would be 0000005a
    Watch this:

    Our void* is now:     0x5a
    And q is: Z
    $