列表1 .跟踪出入字符串变量。

Listing 1. Tracking the input string variable.

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初始化一个空堆栈，将结果字符串变量置空。

Initialize an empty stack and empty result string variable.

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字符串变量需要按正确的语法包含sql子句。

A string variable needs to contain the SQL clause in the correct syntax.

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If somewhere later on in the code it shifts to string, I might not be manipulating that and getting actual values out, but not what I wanted, and it's going to be really hard for me to chase it back.

然后后面的一些代码,把变量类型变为了字符串，我可能不会通过实际操作,去取得实际的变量的类型，但是这并不是我想要的类型,而且对我来说把类型，变回去也很困难。

麻省理工公开课 - 计算机科学及编程导论课程节选

We've been using strings thus far to get input from user and store it in variables.

迄今为止，我们用字符串来接受用户的输入,然后存储在变量里。

哈佛公开课 - 计算机科学课程节选

All right? And if you want to do other things, whoops, sorry-- and add them together, we will get out, again, a concatenation of that string. And these will, we'll let you work through the variations, but these are the simple expressions we can use.

对不对？如果你想要进行一些别的操作，哦，对不起-是加到一块，然后结果值也是，两个字符串的链接，这些会，我们会让大家慢慢学习变量，但是这些是我们能用的最简单的表达式。

麻省理工公开课 - 计算机科学及编程导论课程节选