Fibonacci number calculator in go

fibonacci.go

package main

import (
	"flag"
	"fmt"
	"time"
)

var n int

func fib(n int) int {
	for n > 1 {
		return fib(n-1) + fib(n-2)
	}
	return n
}

func main() {
	startTime := time.Now()
	num := fib(n)
	fmt.Printf("Fibonacchi number for %d is %d\n", n, num)
	fmt.Println("Exec time:", time.Since(startTime))
}

func init() {
	flag.IntVar(&n, "n", 1, "Fibonacci number to be found")
	flag.Parse()
}