List several distinguishing characteristics of functional programming languages. Briefly describe the behavior of the Lisp/Scheme read-eval-print loop. What is a first-class value? Why does OCaml...

List several distinguishing characteristics of functional programming languages. Briefly describe the behavior of the Lisp/Scheme read-eval-print loop. What is a first-class value? Why does OCaml provide separate arithmetic operators for integer and floating-point values?