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

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 2

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;

Answer 3

声明了一个称为PComplex的类型同义词，它实际上是100个RComplex项的数组。