fixup: Swift example takes arguments from CLI

Signed-off-by: Richard Zak <[email protected]>

Swift/fibonacci/fibonacci.swift

@@ -1,12 +1,29 @@
-func fibonacci(n: Int) -> Int {
-var a = 0
-var b = 1
-for _ in 0..<n {
-let temp = a
-a = b
-b = temp + b
+func FibonacciSequence(n: Int) -> Int {
+	if n <= 1 {
+		return n
+	}
+
+	return FibonacciSequence(n: n-1) + FibonacciSequence(n: n-2)
+}
+
+let default_n = 10
+
+var n = default_n
+
+let arguments = CommandLine.arguments
+
+if (arguments.count > 1) {
+    n = Int(arguments[1]) ?? default_n
+} else {
+	print("Which Fibonacci index to find? ")
+	if let line = readLine() {
+		n = Int(line) ?? default_n
+	}
 }
-return a
+
+if n < -1 {
+	n = default_n
 }
 
-print(fibonacci(n:7))
+
+print("Fibonacci sequence number at index \(n) is \(FibonacciSequence(n: n))")