breaking stuff and futzing with null

ex7.c

@@ -26,5 +26,11 @@ int main(int argc, char *argv[])
     printf("Which means you should care %d%%.\n",
             care_percentage);
 
+    puts("also...");
+    int nul = (int)nul_byte;
+    int *nul_ptr = &nul;
+    printf("char '\\0' = '%c', (int)'\\0' = '%d', &(int)'\\0' = '%n'.\n",
+            nul_byte, nul, nul_ptr);
+
     return 0;
 }