Sequential Data Files - Magnetic Tape and Compact Disc - Pseudocode - IT Assessment Answer

IT Assessment Answer

Assignment Task: 1.1. What is a Sequential Data Files (Text Files) Sequential Data File is a type of computer file which stores the data in chronological order. The data is pile up in an ordered or unordered way in the files. In other words, sequential data file is a text file similar to the program written in the note pad and saved as.txt file. These sequential files can also be read by various programming languages including but not limited to Java, C#, Visual basic, C++ and so forth. The data of the text file is read sequentially i.e., sequential file data are read from the initial location up to end of the desired data. Sequential access devices, such as magnetic tape and compact disc(CD) are used to store the Sequential Data File. 1.2. Understand the generic statements using the file above to perform the following: 1.2.1. Opening the sequential access file: Every file that is used in the program must be opened before it can be used. The opening statements were categorized as follows: a) open input (name of the file): This statement is used when an input file is opened. E.g. open input (Students.txt) b) open outputCreate (name of the file): This statement is used when an output file is opened to create a new output file. E.g. open outputCreate (Students.txt) c) open outputAppend (name of the file): This statement is used when an output file is opened to append or add new text lines to it. E.g. open outputAppend (Students.txt) 1.2.2. Closing a sequential access file: A file should be closed as soon as all the text has been read from it to prevent loss of information when using an input file. a) close (name of the file). E.g. close (Students.txt) 1.2.3. Reading the information from the sequential access file: A sequential access file is always read from the beginning of the file. Lines can be read from a file until the end-of-file (eof) character is found, which indicates that the file doesn’t contain any data that has not been read. a) read (name of file).E.g. StudentData = read(Students.txt) 1.2.1. Writing the information sequential access file: A text lines can be added to an existing file or a new output file can be created. a) write (name of file).E.g. write (Students.txt).

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