Clojure 1.0.0

Version of implementation Clojure of programming language Lisp

A version of Clojure implementation.

Links:

Examples:

Hello, World! - Lisp (391):

(printf "Hello, World!")

Factorial - Lisp (392):

This example uses recursive factorial definition. range with one argument generates a list of numbers from 0 (inclusive) to this number (exclusive). str concatenates strings. dec is decrement, equivalent to (- x 1). doseg is Clojure-style loop. 

(defn factorial [x]
  (if (< x 2)
    1
    (* x (factorial (dec x)))))

(doseq [i (range 17)]
  (println (str (str i "! = ") (factorial i))))

Factorial - Lisp (393):

To calculate factorial of a number, one can create a range of numbers from 2 to this number and calculate the product of these numbers (function apply). 

(doseq [i (range 17)]
  (println (str (str i "! = ") (apply * (range 2 (inc i))))))

Fibonacci numbers - Lisp (394):

This example uses recursive definition of Fibonacci numbers. 

(defn fibonacci [x]
  (if (< x 2)
    x
    (+ (fibonacci (- x 1)) (fibonacci (- x 2)) )))

(doseq [i (range 1 17)]
  (print (str (fibonacci i) ", ")))
(println "...")

Quadratic equation - Lisp (395):

(defn solve-quadratic [a b c]
  (if (= a 0)
    "Not a quadratic equation."
    (let [D (- (* b b) (* 4 a c))
          k1 (- 0 b)
          k2 (* 2 a)]
         (if (= D 0)
            (str "x = " (/ k1 k2))
            (if (> D 0)
                (let [k3 (Math/sqrt D)]
                     (str (str "x1 = " (/ (+ k1 k3) k2) (str "\nx2 = " (/ (- k1 k3) k2)))))
                (let [k3 (Math/sqrt (- 0 D))]
                     (str (str (str (str "x1 = (" (/ k1 k2)) (str ", " (/ k3 k2))) ")\nx2 = (") (str (str (/ k1 k2) ", ") (str (- 0 (/ k3 k2)) ")") ))
                ))))))

(import '(java.util Scanner))
(def scan (Scanner. *in*))
(def a (.nextInt scan))
(def b (.nextInt scan))
(def c (.nextInt scan))
(println (solve-quadratic a b c))