Declaration or Definition in C

Question

From External Variables Wiki:

If neither the extern keyword nor an initialization value are present, the statement can be either a declaration o

Answer 1

The C standard says that

A definition of an identifier is a declaration for that identifier that: for an object, causes storage to be reserved for that object (…)

Definitions encompass declarations, i.e., every definition is necessarily a declaration, so it doesn’t make sense to say that

int i;

is not a declaration. It is a declaration which also happens to be a definition. Or, it is a definition, hence a declaration.