Each "field" defines a named region of memory 1 or more bytes long, with an optional text description that is meaningful within the context of your program.
每一个“字段”都定义了内存1的命名区域或者更多的比特，以及一个在程序内容中有意义的可选文本描述。
2
We will start with an overview of the program, followed by a sectional description of each component.
让我们先来看一看程序的概述，接下来再分节说明每个组件。
3
To wrap it up, examine the general structure of the program, in Listing 1. For reasons of clarity, I shortened the code shown here with a short description of each method.