Just another update

Task/Caesar-cipher/OOC/caesar-cipher.ooc

@@ -0,0 +1,19 @@
+main: func (args: String[]) {
+        shift := args[1] toInt()
+        if (args length != 3) {
+                "Usage: #{args[0]} [number] [sentence]" println()
+                "Incorrect number of arguments." println()
+        } else if (!shift && args[1] != "0"){
+                "Usage: #{args[0]} [number] [sentence]" println()
+                "Number is not a valid number." println()
+        } else {
+                str := ""
+                for (c in args[2]) {
+                        if (c alpha?()) {
+                                c = (c lower?() ? 'a' : 'A') + (26 + c toLower() - 'a' + shift) % 26
+                        }
+                        str += c
+                }
+                str println()
+        }
+}