How to convert a float to integer?[Solved]

I thought the function 'round' might work, but it fails to do what I want.
Neither does 'coerce'. So I'm wondering is there any built-in function that works on this, say convert 2.1 to 2 and 2.9 to 3?

Thanks for answering a newbie's question.

Common Lisp has a large number of rounding functions for many rounding modes. What do you mean ROUND did not work?

CL-USER> (round 2.1)
2
0.099999905
CL-USER> (round 2.9)
3
-0.099999905

Do note that the second printed number is the secondary return value of the function, the remainder, and it is discarded in standard evaluation context.

Thx. I tried
(setf a (round 2.1))
and it works.
I was just confused by the TWO return value.
What should I do, if I want to capture these 2 value in 2 different variable by using "round"?

There is a chapter on multiple value returning functions in Practical Common Lisp.

That's great. Thanks!

Ramarren wrote:There is a chapter on multiple value returning functions in Practical Common Lisp.