go언어 const

const에 대해서(c언어 동일 python은 상수선언이 없다고 나온다.)

package main
import (
   "fmt"
   "math/rand"
)
func main() {
   const x int = rand.Intn(10)
   fmt.Print(x)
}
# command-line-arguments
./test.go:7: const initializer rand.Intn(10) is not a constant
----------------------------------------------------------------------------------
package main
import (
   "fmt"
   //"math/rand"
)
func main() {
   //const x int = rand.Intn(10)
   const x int = 10
   fmt.Print(x)
   x = 20
   fmt.Print(x)
}
# command-line-arguments
./test.go:10: cannot assign to x