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The look-it-up principle: Whenever practicable, a program should look up a frequently needed answer, rather than computing that answer.
For example, in Segment 269, the fCalories,
cCalories, and pCalories instance variables reside in the
Food class, whereas in Segment 272, the fGrams,
cGrams, and pGrams instance variables appear. The right
choice depends on whether you are more likely to be interested in calories
or in grams.