IMPORTANT: if the file is successfully found, the file is opened and you should close it as shown in the program above. If the required file is found the IOResult returns a 0 value, meaning no errors ELSE if not found (IOResult returns a non-0 value) display an error message! Writeln('The first line of the file reads: ',s) Writeln('The file required to be opened is not found!') Writeln('Enter the file name (including its full path) of the text file (without the extension):')
Turbo pascal example programs how to#
We will still use the readln() and writeln() in order to read and write from/to a text file The concept of how to read a text file is demonstrated below: Program Lesson8_Program1
There are special functions in Pascal that enable us to read or write a text file. We only require a few bytes, don't worry!īack To Top ⇧ Read from a File (file input) So other files may contain more data other than just text data.īefore we proceed with files, please make sure that you have enough hard disk space for our practice, since I am going to demonstrate to save a file to the hard disk!! :) Just kiddin'. Such files cannot be saved as plain text since extra data is needed to store the formatting. However, some programs have various rich text formats in which text maintains a certain format - such as justification, font-face and font colour.
Whenever you use a text editor and create a text file, the saved file is written on to the permanent storage. Many text files are saved on permanent storage such as hard disks with the extension. Files have got the advantage of not losing their data after a program terminates (provided that data is saved properly to the file).Ī file can contain either text data or binary data. When we use variables, their data will be lost when the program terminates. A file contains data which is stored on a permanent medium.
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