euler / clojure / 20.clj

; n! means n × (n − 1) × ... × 3 × 2 × 1
; 
; Find the sum of the digits in the number 100!
;
; Answer: 648

(defn fact [n]
 (apply * (range 1 (inc n))))


(defn char->int [c]
  (- (int c) (int \0)))

(let [s (str (fact 100))]
  (prn (apply + (map char->int s))))
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.