factorial.go

package main

import "fmt"

func fac(n int) int {
	ret := 1
	for i := n; i > 1; i-- {
		ret *= i
	}
	return ret
}

func facR(n int) int {
	if n == 1 {
		return 1
	}
	return n * facR(n-1)
}

func main() {
	fmt.Println(fac(5))
	fmt.Println(facR(5))
}