chann2.go

package main
import "fmt"

func main() {
    messages := make(chan string)
    signals := make(chan bool)
   select {
    case msg := <-messages:
        fmt.Println("received message", msg)
    default:
        fmt.Println("no message received")
    }
   msg := "hi"
    select {
    case messages <- msg:
        fmt.Println("sent message", msg)
    default:
        fmt.Println("no message sent")
    }
}