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In Chapter 2, you learned you can multiply 194 by 9, hence computing the number of calories in 194 grams of fat, as follows:
194 * 9
Of course, if you propose to compute calorie content many times,
you should arrange for the appropriate work done by a new method, as in the
following expression, in which a fatToCalories message is sent to an
instance of the Integer class:
194 fatToCalories
To respond to the fatToCalories message, the receiver, 194,
must find the method identified by the fatToCalories selector and
follow the instructions found in that method.
Accordingly, you must learn how to define a fatToCalories method
appropriate for fatToCalories messages sent to instances of the
Integer class.