Hi pradeep, I think it is normal behaviour for gcalctool.
What the parser is intended to do is, process not for expressoin "<NOT> <NUMBER>".
The Not button inserts a <NOT> symbol in text, which is then passed to parser with structure similar like "<NUMBER> <NOT>".
So, what you need to do is press not button before entering the number.
Hi pradeep, I think it is normal behaviour for gcalctool.
What the parser is intended to do is, process not for expressoin "<NOT> <NUMBER>".
The Not button inserts a <NOT> symbol in text, which is then passed to parser with structure similar like "<NUMBER> <NOT>".
So, what you need to do is press not button before entering the number.
Hope this helps.