【Go Time】Go言語定数定義キーワードconst

func consts() {
      const filename = "abc.txt"
      const a, b = 3, 4
      var c int
      c = int(math.Sqrt(a*a + b*b))
      fmt.Println(filename, c)
}

package main
const filename = "abc.txt"

const (
   filename = "abc.txt"
   a, b = 3, 4
)

const a, b = 3, 4
var c int
//            
c = int(math.Sqrt(a*a + b*b))

const (
   cpp = iota
   _
   python
   golang
   javascript
)
fmt.Println(cpp,python,golang,javascript) // 0 2 3 4

const (
   b = 1 << (10 * iota)
   kb
   mb
   gb
   tb
   pb
)
fmt.Println(b,kb,mb,gb,tb,pb) 
// 1 1024 1048576 1073741824 1099511627776 1125899906842624