| // Copyright 2021 The Go Authors. All rights reserved. | |
| // Use of this source code is governed by a BSD-style | |
| // license that can be found in the LICENSE file. | |
| package a | |
| func Fact[T interface{ int | int64 | float64 }](n T) T { | |
| if n == 1 { | |
| return 1 | |
| } | |
| return n * Fact(n-1) | |
| } |