a few questions about c syntax

what is the difference between

typedef struct
{
 int number;
} Stuff;

Stuff a;

and

struct Stuff
{
 int number;
}

?

I forgot to add a Stuff a; declaration at the end of the post, sorry

You can't forward-declare typedefs. This is very handy for public header files, as your API can deal in pointers to forward-declared structs only (the actual definitions are in private headers) and it's more difficult for client code to see what's in them.

first one you don't need to specify struct when declaring a variable.  second one you do.  otherwise, they're synonymous.

the actual type is a struct something. typedef is a general construct for giving a type an alias. in the first example you are defining an alias for an struct without a name. But you can also do, if i'm not wrong (I actually haven't coded in C in ages):

struct stuff_aux
{
 int number;
}

typedef struct stuff_aux Stuff;

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