6.9 Bit-fields

• A bit-field or field for short, is a set of adjacent bits within a single implementation-defined storage unit that we will call a "word"

6.8 Unions

• A union is a variable that may hold (at different times) objects of different types and sizes, with the compiler keeping track of size and alignment requirements 
• Unions provide a way to manipulate different kinds of data in a single area of storage, without embedding any machine-dependent information in the program
• Syntax:

6.7 Typedef

• C provides a facility called typedef for creating new data type names
• ie. typedef int Length;        (Length a synonym for int)
• ie. typedef char *String;       (String a synonym for char * or character pointer)

6.6 Table Lookup

6.5 Self-referential Structures

6.4 Pointers to Structures

• Structure pointer:

6.3 Arrays of Structures

• Structure type key, with an array keytab of structures. Each elements of the array is a structure:

• Initialization: