C++ typedef meaning

Question

What does the following mean in C++?

typedef PComplex RComplex [100];

Note, PComplex is a user-defined type in my code.

Thanks

Answer 1

The declares a type synonym called PComplex which is actually an array of 100 RComplex items.

Answer 2

RComplex is a synonym for PComplex[100]. Typedefs have a similar syntax to variable declarations, except in place of a variable name you get a typename.

Answer 3

This aliases RComplex to the type "array (of length 100) of PComplex", also known as PComplex[100]. The following two variable declarations give each the same type: (after the above typedef)

PComplex a[100];
RComplex b;