Using the OnlineGDB web interface can I read data from an external file rather than the Standard Input?

Question

I would like to read text from and write text to external data files rather than the Standard Input and Output (stdout) that's on the bottom of web browser interface. I am using the pascal compiler and the Read(InData, parameter ..) statement where InData is defined as type Text in the var section.

The compiler gives the following error message:

Runtime error 2 at $00000000004016C6
  $00000000004016C6
  $000000000042360C

Answer 1

Working with text file is rather simple in Pascal. See the below example for first writing data to a text file, then reading it back from it.

program FileTest;
var
    outputFile: text;
    inputFile: text;
    line: String;
begin
    Assign(outputFile, 'test.txt');
    Rewrite(outputFile);
    WriteLn(outputFile, 'First line');
    WriteLn(outputFile, 'Second line');
    Close(outputFile);
    WriteLn('WRITING - All Done');

    Assign(inputFile, 'test.txt');
    Reset(inputFile);
    while not eof(inputFile) do
    begin
        ReadLn(inputFile, line);
        WriteLn('Line read: ', line);
    end;
    Close(inputFile);
    WriteLn('READING - All Done');
end.

For more details and how to use binary files, read here.

Answer 2

Thank you very much for your code example and showing how to use the 'Assign' statement. Your example was very helpful.

Comments

I'm glad you're sorted! :)