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    int     age;
    int     weight;

These statements declare the instance variables age and weight to be of TYPE int            (integer).  The remaining data types offered in C are char (character) and float             (floating-point number), as well as larger and higher-precision kinds of integer and floating-point variables.

A note about usage in this document:  a DEFINITION is something which describes the structure of or allocates space for something, whereas a DECLARATION simply identifies the thing so the compiler is not confused.  A struct expression may be thought of as "declaring" the instance variables and methods of a class.  However, although no space is yet allocated for a Person object, the struct expression "defines" the Person class by describing its structure.  (Definitions are usually implicitly declarations, while declarations need not define anything.)

Notice that a semicolon terminates simple C statements like the declaration 'int age;'.  A compound statement like a function body is enclosed by {} braces and is not followed

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