When was the fifth generation programming language developed?
The only decent attempt at a 5th generation programming language was done by japan in the 90’s and it was based on prolog. It was deemed too slow and inefficient to be of viable use, and as such there has been no marketable 5gl to date, so the question would have been better posed as ‘Is there a fifth generation programming language?’ – also note that the idea of 5gl is just that, an idea.
