Language: English.
I read this some time in the late 80s / early 90s. The author must have had a Commodore 64 computer, because printouts from the mainframe computer in the story (which bears similarities to Asimov's Multivac) tend to end with text like this:
READY.
READY.
READY.
READY.
The title is a single word, which is the name of the main protagonist; I think it started with C, like COSMO or CHARLIE or CARL or the like.
At one point, a friend of his dies, and our protagonist is startled at how the computer prints out a beautifully detailed summary of his friend's life, including his innermost thoughts, ending with the READY. READY. ...
prompt.
The big twist is that the last page of the book ends with
READY.
READY.
READY.
READY.
... and you realize that the entire detailed, personal account you have been reading is just another life summary from the computer.
Does anyone recognize the book?