除了“=”指令,变量也可以接受“+”和“-”指令。所以,比如说变量接到了一个指令“+5”,就将5加到了当前值上。对于“-”指令,指令传送的值就由当前值减去。
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According to the author,what is the goal most Americans are taught to aim for in life?
Is teaching the easiest way for the author to earn a living ?How does he feel about teaching?
Why does the author teach?
What are the most important reasons the author gives for choosing teaching as his profession?