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0]; Methods that take a variable number of arguments are also possible, though they’re somewhat rare. Extra arguments are separated by commas after the end of the method name. ) In the following example, the imaginary makeGroup: method is passed one required argument (group) and three that are optional: [receiver makeGroup:group, memberOne, memberTwo, memberThree]; 54 Messages C H A P T E R 3 The Objective-C Language Like standard C functions, methods can return values. The following example sets the variable isFilled to true if myRect is drawn as a solid rectangle, or false if it’s drawn in outline form only.

42 Structuring Programs C H A P T E R 2 Object-Oriented Programming Sometimes one object should be seen as being part of another. For example, a Faucet might use a Meter object to measure the amount of water being released. The Meter would serve no other object and would act only under orders from the Faucet. It would be an intrinsic part of the Faucet, in contrast to an Appliance’s extrinsic connection to a Valve. Similarly, an object that oversees other objects might keep a list of its charges.

It would be an intrinsic part of the Faucet, in contrast to an Appliance’s extrinsic connection to a Valve. Similarly, an object that oversees other objects might keep a list of its charges. A Building object, for example, might have a list of all the WaterPipes in the program. The WaterPipes would be considered an intrinsic part of the Building and belong to it. WaterPipes, on the other hand, would maintain extrinsic connections to each other. Intrinsic outlets behave differently than extrinsic ones.

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