变量初始化（Initialization of variables） 当一个本地变量( local variable)被声明时，它的值默认为未定 (undetermined)。
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Typically, the setup function contains the size function (to define the bounds of the window) as well as initialization of variables that are used during operation.
通常，setup函数包含size函数(用于定义窗口的边界)以及在操作期间要使用的变量的初始化。
Since Perl doesn't have memory allocation issues, the biggest source of bugs for me has been the improper tracking of counter variables (wrong initialization, wrong increments, or wrong bounds).
由于Perl没有内存分配问题，所以对我来说缺陷的最主要来源就是追踪计数器变量的错误(错误的初始化，错误的增量，或者错误的边界)。
Initialization of local variables to a nonzero value.
将局部变量初始化为非零值。
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