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In Chapter 11, you learned that each instance of a class contains its
own set of instance-variable values, so each Food instance, for
example, contains its own values for the fCalories,
cCalories, and pCalories' variables.
Because each instance maintains its own values for all instance variables, you would not want to use an instance variable for a value that does not vary from one instance to another.
For example, the number of calories contributed to a food by a gram of fat does not vary from food to food.