inline offsetof

modules/structures.md

@@ -203,6 +203,22 @@ de-reference operator on `foo`.
 
 #solution struct-access-ptr.c
 
+### :wrench: Getting offset of a member
+
+Write a macro (or start with a function with hardcoded values) that will print
+the offset of the specified member of a given structure.
+
+```C
+      offsetof(struct X, a)
+```
+
+Hint: exploit the fact that pointer can be assigned an integer (0) + use pointer
+arithmetics
+
+Note: `offsetof()` is a standard macro available since ANSI C via `stddef.h`.
+
+#solution offsetof.c
+
 ## Structure initialization
 
 Can initialize a structure in its definition using the initiator list of values.