本文首先论述了如何设计程序来限制数据可以进入您的程序的途径，以及您的设计会如何影响哪些可以成为输入。
It first discusses how to design your program to limit the ways data can get into your program, and how your design influences what is an input.
首先我们讨论了哪些问题最适合使用代码生成程序来解决。
First we discussed which problems were best solved with a code-generating program. These include the following.
在设计应用程序时，首先确定一系列需求；然后使用某种功能分解方法决定需要编写哪些代码来满足这些需求。
Designing an application starts with the list of requirements and USES some type of functional decomposition to determine what code you will need to write to fulfill them.
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