github.com/yukk001/go1.10.8@v0.0.0-20190813125351-6df2d3982e20/doc/progs/eff_bytesize.go (about) 1 // Copyright 2009 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package main 6 7 import "fmt" 8 9 type ByteSize float64 10 11 const ( 12 _ = iota // ignore first value by assigning to blank identifier 13 KB ByteSize = 1 << (10 * iota) 14 MB 15 GB 16 TB 17 PB 18 EB 19 ZB 20 YB 21 ) 22 23 func (b ByteSize) String() string { 24 switch { 25 case b >= YB: 26 return fmt.Sprintf("%.2fYB", b/YB) 27 case b >= ZB: 28 return fmt.Sprintf("%.2fZB", b/ZB) 29 case b >= EB: 30 return fmt.Sprintf("%.2fEB", b/EB) 31 case b >= PB: 32 return fmt.Sprintf("%.2fPB", b/PB) 33 case b >= TB: 34 return fmt.Sprintf("%.2fTB", b/TB) 35 case b >= GB: 36 return fmt.Sprintf("%.2fGB", b/GB) 37 case b >= MB: 38 return fmt.Sprintf("%.2fMB", b/MB) 39 case b >= KB: 40 return fmt.Sprintf("%.2fKB", b/KB) 41 } 42 return fmt.Sprintf("%.2fB", b) 43 } 44 45 func main() { 46 fmt.Println(YB, ByteSize(1e13)) 47 }