Is it a definition or a declaration?

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What is the difference between a definition and a declaration? 25 answers

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It's a declaration. It declares the type struct foo .

(C99, 6.7p5) "A declaration specifies the interpretation and attributes of a set of identifiers. A definition of an identifier is a declaration for that identifier that:

— for an object, causes storage to be reserved for that object;

— for a function, includes the function body;101)

— for an enumeration constant or typedef name, is the (only) declaration of the identifier."

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Your understanding is correct. Your code example is a declaration of a type. In 'C' you can declare a type and immediately use it to define a variable.

So your example is a pure declaration.

And here is an example of declaration+variable definition:

struct foo {
     char name[10];
     char title[10];
     int  salary;
} var;

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