New subject: Write doesn't work with CRT

24 Jan 2009


      ...
Depending on what you want to do,
either
         writeln("sqrt(-1)");
or
         writeln(sqrt(1));
works.
I'm sorry, I haven't made it clear the first time. So:
With CRT, all writeln do nothing. For example:
uses crt;
begin
writeln('OK')
end.
produces nothing.
uses crt; 
begin
writeln('OK');
writeln(sqrt(-1))
end.
produces just the error message from sqrt(-1), NOT 'OK'.
Same programs without "uses crt;" both include 'OK' (the latter before
the error message).
...
You might try:
program testcrt;
uses gpc, crt; 
begin
    writeln('OK');
    sleep(10);
    writeln(sqrt(-1));
end.
Now I understand more about the problem. If I put the CRT unit in, each
write will actually be to some virtual screen appearing on top of my
console and disappearing after program finished. As all test programs
above finish quickly, I simply can't see it. Therefore, this sample:
program testcrt;
uses gpc, crt;
begin
    writeln('OK');
    readln
end.
works as expected, but there is nothing left on the console after it
ran. Is this by design? Because I might have programs which use CRT for
every kind of things and I still must see their output.

Re: Write doesn't work with CRT