默认的选项包括最大值、最小值、唯一值和未定义值。
Default selections include Max, min, unique, and undefined values.
它只保存一段数据：一个字符串、一个数字、未定义的值以及对另一个变量的引用。
They hold only one piece of data: a string, a number, the undefined value, a reference to another variable.
它还让用户可以显示应用程序中任意未定义的值。
It also allows the user to display any undefined values in the application.
该函数也会正确地处理未定义的值，尽管在警告打开时，常规表达式在匹配未定义的值时会输出警告信息。
It works correctly with undefined values as well, whereas with warnings turned on, a regular expression match on an undefined value will print a warning.
不用再检查默认的复合值，您也可以捕获对未定义变量的访问。
Instead of checking for a default compound value, you can also catch the access to an undefined variable. E.g.
延迟初始化的主要缺点是：代码将变得更复杂，因为需要查看是否定义了属性，如果还未定义，则要获取属性值。
The main disadvantage of lazy initialization is that your code becomes more complex because you need to check to see if the attribute has been defined yet and, if not, obtain its value.
这些标记引起的常见错误是：不正确的引用和取消引用，使用未定义的值，以及帮助判断输入错误，例如未使用的值或未定义的函数。
Common faults picked up by these pragmas are ambiguous references and de-references, use of undefined values, and some help identifying typos for unused or undefined functions.
但在DB 2中，如果未定义该值，则必须在insert语句中为NOTnull列提供值。
But in DB2, you must provide a value for NOT NULL columns in an INSERT statement when a default hasn't been defined.
然而要注意的是，该函数本身也只是另一个person对象的属性，如果没有圆括号，它将引用一个未定义的值。
Notice, however, that the function itself is just another property of the person object and that, without the parentheses, it would refer to an undefined value.
如果在您的实现中不对实例进行钝化，那么“inventory”Iterator将为空，或者更糟，具有来自另一个对话的未定义的值。
If instances in your implementation ever get passivated, the inventory Iterator will be null — or worse, have some undefined value from another session!
它的默认值为未定义，但如果请求中有params，将会默认作为POST处理。
It defaults to undefined, but will be treated as POST by default if there are params in the request.
清单1显示了一个简单的例子，它声明了一个包含6个属性的hash：一个字符串、一个整数、一个布尔值、一个未定义的属性、另一个hash和一个函数。
A simple example is shown in Listing 1, declaring a hash consisting of 6 attributes: a string, an integer, a Boolean, an undefined attribute, another hash, and a function.
另外，由于Perl正在寻找一个真值，因此它也可以忽略未定义的值，而不会抱怨这些值尚未定义。
In addition, because Perl is looking for a true value, it also ignores undefined values without complaining about them. So we can rewrite the above into a single line.
NULL该类型程序头表表项未使用；该表项其他的成员值都是未定义的。这种类型让程序头表忽略程序头表项。
PT_NULL the array element is unused; other members' values are undefined. This type lets the program header table have ignored (whole) entries.
但是所有片段的颜色值都将是未定义的。
But the value of all of the colors that a fragment could have are undefined.
如果终止功能是达到了，和函数调用的值由用于调用，其行为是未定义的。
If the that terminates a function is reached, and the value of the function call is used by the caller, the behavior is undefined.
如果终止功能是达到了，和函数调用的值被访客，的行为是未定义的。
If the that terminates a function is reached, and the value of the function call is used by the caller, the behavior is undefined.
所创建的这些元素的值全部未定义。
所创建的这些元素的值全部未定义。
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