| close | file statement |
| Syntax | A closeStatement is:
| |||||||||
| Description | In Turing, files are read and written using a fileNumber. In most cases, this number is given a value using the open statement, which translates a file name, such as "Master", to a file number, such as 5. When the program is finished using the file, it disconnects from the file using the close statement.
| |||||||||
| Example | This program illustrates how to open, read and then close a file.
var fileName : string := "Master" % Name of file
var fileNo : int % Number of file
var inputVariable : string (100)
open : fileNo, fileName, read
…
read : fileNo, inputVariable
…
close : fileNo
| |||||||||
| Details | In a Turing implementation, there will generally be a limit on the number of currently open files. This limit will typically be around 20. To avoid exceeding this limit, a program that uses many files one after another should close files that are no longer in use. If a program does not close a file, the file will be automatically closed when the program finishes. There is an older and still acceptable version of close that has this syntax:
close (fileNumber : int) | |||||||||
| See also | the open, get, put, read, write, seek and tell statements.
| |||||||||