mirror of
https://github.com/golang/go
synced 2024-11-17 03:14:50 -07:00
34 lines
626 B
Go
34 lines
626 B
Go
|
// run
|
||
|
|
|
||
|
|
// Copyright 2020 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.
|
||
|
|
|
||
|
|
// Issue #43480: ICE on large uint64 constants in switch cases.
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
func isPow10(x uint64) bool {
|
||
|
|
switch x {
|
||
|
|
case 1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
|
||
|
|
1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19:
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
var x uint64 = 1
|
||
|
|
|
||
|
|
for {
|
||
|
|
if !isPow10(x) || isPow10(x-1) || isPow10(x+1) {
|
||
|
|
panic(x)
|
||
|
|
}
|
||
|
|
next := x * 10
|
||
|
|
if next/10 != x {
|
||
|
|
break // overflow
|
||
|
|
}
|
||
|
|
x = next
|
||
|
|
}
|
||
|
|
}
|