# Defining a Function

<code>
(defn functionname
   “optional documentation string”
   [arguments]
   (code block))
</code>

### Example

<code>
(ns clojure.examples.hello
   (:gen-class))

;; This program displays Hello World
(defn Example []
   (def x 1)
   (def y 1.25)
   (def str1 "Hello")
   (println x)
   (println y)
   (println str1))
   
(Example)
</code>

#### Output

<code>
1
1.25
Hello
</code>

## Refs

- https://www.tutorialspoint.com/clojure/clojure_defining_a_function.htm