pingpong.go

package main

import (
	"fmt"
	"time"
)

func pinger(channel chan<- string) {
	for {
		channel <- "ping"
	}
}

func ponger(channel chan<- string) {
  for {
    channel <- "pong"
  }
}

func printer(channel <-chan string) {
	for {
		msg := <-channel
		fmt.Println(msg)
    time.Sleep(time.Second * 1)
	}
}

func main() {
	channel := make(chan string)

	go pinger(channel)
  go ponger(channel)
	go printer(channel)

	var input string
	fmt.Scanln(&input)
}