Data commit

Task/ISBN13-check-digit/Nanoquery/isbn13-check-digit.nanoquery

@@ -0,0 +1,36 @@
+def checkIsbn13(isbn)
+        // remove any hyphens or spaces
+        isbn = str(isbn).replace("-","").replace(" ","")
+
+        // check length = 13
+        if len(isbn) != 13
+                return false
+        end
+
+        // check only contains digits and calculate weighted sum
+        sum = 0
+        for i in range(0, len(isbn) - 1)
+                c = isbn[i]
+                if (ord(c) < ord("0")) or (ord(c) > ord("9"))
+                        return false
+                end
+
+                if (i % 2) = 0
+                        sum += ord(c) - ord("0")
+                else
+                        sum += 3 * (ord(c) - ord("0"))
+                end
+        end
+
+        return (sum % 10) = 0
+end
+
+isbns = {"978-1734314502", "978-1734314509", "978-1788399081", "978-1788399083"}
+for isbn in isbns
+        res = "bad"
+        if checkIsbn13(isbn)
+                res = "good"
+        end
+
+        print format("%s: %s\n", isbn, res)
+end