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计算机
A typical(160)language contains an applicative sub-language which approximates the mathematical abstractions of "timeless" funct
A typical(160)language contains an applicative sub-language which approximates the mathematical abstractions of "timeless" funct
admin
2009-05-15
82
问题
A typical(160)language contains an applicative sub-language which approximates the mathematical abstractions of "timeless" functions applied to "spaceless" values, where the actual operation sequences and use of storage space during expression evaluation are organized behind the(161). In this setting, values are data structures of low volume, typically a few computer words or less, which means that an illusion of spacelessness can be realized by having(162)results during expression evaluation stored at the discretion of the language implementation, and effecting parameter(163)and(164)operations through value copying.
选项
A、assignment
B、design
C、value
D、dispatch
答案
A
解析
典型的强制型语言都包含一个应用型子语言,它类似于一种数学抽象,把不耗费时间的函数应用于无需空间的值。在表达式求值期间的实际操作序列和使用的存储空间都隐藏在计算现场之后。在这种假设之下,被传递的值只是少量的数据结构,通常只有几个计算机字长,甚至更少。这意味着不耗费空间的设想可以这样来实现:表达式求值过程中产生的中间结果可以根据语言的实现存储在任意位置,结果参数的传递和赋值操作都可以通过值的拷贝来实现。
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