go-play / fact.go

package main

import (

func fact(n int64) *big.Int {

	f := big.NewInt(0)
	f.MulRange(1, n)

	return f


func main() {

	if flag.NArg() != 1 {
		fmt.Println("error: wrong number of arguments")

	n, err := strconv.ParseInt(flag.Arg(0), 10, 64)
	if err != nil {
		fmt.Println("error: bad number -", flag.Arg(0))
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