// objective: test the \interface and \category command

// check: category_integer_07_arithmetic_08.xml

// check: interface_integer.xml

# import <objc/Object.h>

@interface Integer : Object {

 /** data member */

 int integer;

}

/** getter */

- (int) integer;

/** setter */

- (id) integer: (int) _integer;

@end

@interface Integer (Arithmetic)

/** add operation */

- (id) add: (Integer *) addend;

/** subtract operation */

- (id) sub: (Integer *) subtrahend;

@end

/** \interface Integer

 *  An interface 

 */

/** \category Integer(Arithmetic)

 *  A category

 */