First, You CAN Extend A Macro TypeName with Other Type Specifiers, But not a typef 'D TypeName.
That IS,
#define peach int
Unsigned peach i; / * Works fine * /
Typedef int banana;
Unsigned banana i; / * bzzzt! Illegal * /
Second, a typedef 'D name provides the Type for Every Declarator in a Declaration.
#define int_ptr Int * int_ptr chalk, cheese;
After macro expansion, the second line effectively becomes: int * chalk, cheese; This makes chalk and cheese as different as chutney and chives: chalk is a pointer-to-an-integer, while cheese is an integer.
In contrast, a typedef like this:
Typedef char * char_ptr;
CHAR_PTR BENTLEY, ROLLS_ROYCE;
Declares Both Bentley and Rolls_royce to Be The Same. The name on The Front Is Difer, But They Are Both a Pointer To a char.
