standard input/ file input

Question

I probably have a basic problem. I've been trying to read an array from file and AFTER that a string from standard input in Pascal language. It doesn't send an error message, it just doesn't wait 'till I write the input string on the screen. What should I do?

Here's my code:

Procedure beolvas(var x:rangsor; var n:byte; fajl:string);
var i:byte;

Begin
  Assign(input,fajl);
  Reset(input);
Readln(n);
for i:=1 to n do begin
   Readln(x[i].diak);
   Readln(x[i].atlag);
end;
close(input)
End;

Procedure beolvasnev(var s:string; x:rangsor; n:byte);
var i:byte;
Begin
Write('Kerem a diak nevet: ');
Readln(s);
End;

Never assume file access would succeed. Always check the result. — Jay
– Jay, Commented Nov 16, 2012 at 23:00

Sertac Akyuz · Accepted Answer · 2012-11-16 23:12:52Z

2

Try Assign(input, ''); (empty file name) after you've finished with the file variable, that's after you've called close(input).

answered Nov 16, 2012 at 23:12

Sertac Akyuz

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Comments

No'am Newman · Accepted Answer · 2012-11-21 13:20:02Z

1

You're not telling the program from which file to read; in the absence of a file name, the program tries to read from the console, which explains you writing "it just doesn't wait till I write the input string on the screen" (shouldn't that be "it waits until I write the input string"?).

I don't know whether this is deliberate or not, but the first line of the file is expected to hold an integral value. It would be better to read from the file a string variable and then check whether the string is numerical before using it as a loop counter.

answered Nov 21, 2012 at 13:20

No'am Newman

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