[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] Reference for unit 'System' (#rtl)

WriteLn

Write variable to a text file and append newline

Declaration

Source position: system.fpd line 65

procedure Writeln(

  Args: Arguments

);

procedure WriteLn(

  var F: Text;

  Args: Arguments

);

Description

WriteLn does the same as Write for text files, and emits a Carriage Return - LineFeed character pair after that. If the parameter F is omitted, standard output is assumed. If no variables are specified, a newline character sequence is emitted, resulting in a new line in the file F.

Remark: The newline character is determined by the slinebreak constant.
Remark: When writing string variables, no codepage conversions are done. The string is copied as-is to the file descriptor. In particular, for console output, it is the programmer's responsibility to make sure that the codepage of the string matches the codepage of the console.

Errors

If an error occurs, a run-time error is generated. This behavior can be controlled with the {$I} switch.

See also

Write

  

Write variable to a text file

Read

  

Read from a text file into variable

Readln

  

Read from a text file into variable and goto next line

Blockwrite

  

Write data from memory to an untyped file

slinebreak

  

Alias for LineEnding

Example

Program Example75;

{ Program to demonstrate the Write(ln) function. }

Var
  F : File of Longint;
  L : Longint;

begin
  Write ('This is on the first line ! '); { No CR/LF pair! }
  Writeln ('And this too...');
  Writeln ('But this is already on the second line...');
  Assign (f,'test.tmp');
  Rewrite (f);
  For L:=1 to 10 do
    write (F,L); { No writeln allowed here ! }
  Close (f);
end.

Documentation generated on: Nov 16 2015