相关题目
266、In computer science an array is a data structure consisting of a group of elements that are accessed by indexing.In most programming languages each element has the same data type and the array occupies a contiguous area of storage.Most programming languages have a built-in array data type , although what is called an array in the language documentation is sometimes really an associative array.Conversely, the contiguous storage kind of array discussed here may alternatively be called a vector, list , or table.Some programming languages support array programming ( ) which generalizes operations and functions to work transparently over arrays as they do with scalars, instead of requiring looping over array members.Multi-dimensional arrays are accessed using more than one index:one for each dimension.Arrays can be classified as fixed-sized arrays ( ) whose size cannot change once their storage has been allocated or dynamic arrays, which can be resized.Fixed-size arrays permit efficient random access.They are compact data structures, having a constant memory overhead.And, on CPUs which support caches sequential iteration over an array has good locality of reference because its elements occupy contiguous memory locations.However, when an array is randomly accessed , for example when probing a hash table, locality of reference may be lost.(2)、Which of the following statements about array is correct?
266、In computer science an array is a data structure consisting of a group of elements that are accessed by indexing.In most programming languages each element has the same data type and the array occupies a contiguous area of storage.Most programming languages have a built-in array data type , although what is called an array in the language documentation is sometimes really an associative array.Conversely, the contiguous storage kind of array discussed here may alternatively be called a vector, list , or table.Some programming languages support array programming ( ) which generalizes operations and functions to work transparently over arrays as they do with scalars, instead of requiring looping over array members.Multi-dimensional arrays are accessed using more than one index:one for each dimension.Arrays can be classified as fixed-sized arrays ( ) whose size cannot change once their storage has been allocated or dynamic arrays, which can be resized.Fixed-size arrays permit efficient random access.They are compact data structures, having a constant memory overhead.And, on CPUs which support caches sequential iteration over an array has good locality of reference because its elements occupy contiguous memory locations.However, when an array is randomly accessed , for example when probing a hash table, locality of reference may be lost.(1)、Which of the following statements about array programming is correct?
265、The application layer provides an interface for the operating system or network applications to network services.
264、The data link layer provides services to the network layer on the basis the services provided by the physical layer.
263、The abbreviation of File Transfer Protocol is .
262、The device used to store programs and data in a computer is .
261、The channel realizes the unified management of the peripheral equipment and the data transfer between the peripheral equipment and the main memory.
260、The bus is a common data channel for information between computer equipment and equipment, shared by all devices on the bus.
259、Disk array is a fast, large-capacity, and reliable external memory subsystem composed of multiple disk storages.
258、It is mainly of magnetic surface memory, optical disk memory and solid-state hard disk.
