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fact.go
// run // 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 main import "fmt" func fact[T interface{ ~int | ~int64 | ~float64 }](n T) T { if n == 1 { return 1 } return n * fact(n-1) } func main() { const want = 120 if got := fact(5); got != want { panic(fmt.Sprintf("got %d, want %d", got, want)) } if got := fact[int64](5); got != want { panic(fmt.Sprintf("got %d, want %d", got, want)) } if got := fact(5.0); got != want { panic(fmt.Sprintf("got %f, want %f", got, want)) } }
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