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2.Running the computer program

The operating system is a collection of program provided by the computer’s manufacturer that allows us to schedule jobs for the computer, to translate source programs into object programs, to sort data stored on secondary storage devices, and to copy data from any input device to any output device. These programs are called control programs, language programs and utility programs.

The control program (often called the supervisor, monitor, or executive) is a main-storage-resident program. Its functions are to schedule jobs, schedule input and output for our programs, and to monitor the execution of our programs.

The language processors are programs that translate source programs into object programs. There are three types of language processors: assemblers, compilers, and interpreters. Each language has its own language processor.

The service programs are programs that are commonly used in all data processing centers. They have functions that are required by everyone using a computer. Examples of service programs include linkage editors to prepare object programs for execution, a librarian to catalog programs into a library area on magnetic disc, utility programs to transfer data from device to device, and sort-merge programs for sorting data on magnetic tape or disk.

3.Testing the computer program

There are two kinds of errors or bugs with which programmers must deal. The first type is the coding error. Such errors are syntax errors that prevent the language processor from successfully translating the source program to object program code. The language processor identifies the nature and the location of the error on the source program listing, so these errors are relatively easy to find and correct. The second type of bug is the logic error. The computer program can be successfully translated, but the program does not produce the desired results. These errors are generally much more difficult to find and to correct than are coding errors. Logic errors can be avoided through careful planning of the program logic, but it is the programmer’s responsibility to test thoroughly all of the program’s functions, in order to verify that the program performs according to specifications.

There are many tools provided to the programmer to help in debugging the program logic. These tools are called debug packages or tracing routines. They assist the programmer in following the logic by printing out calculation results and field values used in making logic decisions in the program. In a few cases it may be necessary to use a memory dump – a printout of the instructions and date held in the computer’s memory – in order to find the cause of logic errors.

Unit VI The Internet and the Web

Internet faQs

1. Read Part 1 of the Internet faQs and choose the correct answers.

1. The Internet was

a) invented in the mid-90s. b) popular in the 1960s. с) probabiy created in the USA.

2. Which term describes any fast, high-bandwidth connection?

a) broadband b) dial-up connection с) Wi-Fi connection

3. The power line Internet provides broadband access through

a) telephone lines. b) satellites. с) electrical power lines.

4. Which device converts computer data into a form that can be transmitted over phone lines?

a) ADSL b) a mobile phone с) a modem

5. The standard protocol that allows computers to communicate over the Internet is called

a) an IP address b) TCP/IR с) HTTP.

6. The geographical region covered by one or several access points is called

a) a wireless access point. b) hotspot. с) wireless network device.

Active Vocabulary

Internet Service Provider -

to carry out -

broadband connection -

connection software -

high-speed -

Asymmetric Digital Subscriber Line (ADSL) -

broadband access -

power plug -

transmission control protocol (TCP) -

Internet-protocol -

wireless access point -

hotspot -

terrestrial -

high-end -

Интернет-провайдер; поставщик Интернет-сервиса

проводить; выполнять; осуществлять

широкополосное соединение

программное обеспечение связи

высокоскоростной

асимметричная цифровая абонентская линия

широкополосный доступ (в Интернет)

разъём электропитания

протокол управления передачей данных

Интернет-протокол

точка беспроводного доступа

очень популярное и посещаемое заведение

наземный

высокотехнологичный; высококачественный; элитный; дорогой

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