DOSXCODE.PAS
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 { Example for DosExitCode and Exec }

  {$M $4000,0,0 }   { 16K stack, no heap }
  uses Dos;
  var
    ProgramName, CmdLine: string;
  begin
    Write('Program to Exec (full path): ');
    ReadLn(ProgramName);
    Write('Command line to pass to ',
          ProgramName, ': ');
    ReadLn(CmdLine);
    WriteLn('About to Exec...');
    SwapVectors;
    Exec(ProgramName, CmdLine);
    SwapVectors;
    WriteLn('...back from Exec');
    if DosError <> 0 then{ Error? }
      WriteLn('Dos error #', DosError)
    else
      WriteLn('Exec successful. ',
              'Child process exit code = ',
              DosExitCode);
  end.