main.go

package main

import "fmt"

func ping(msg chan string, p *int) {
	msg <- "ping"
	*p = 200
}

func main() {
	msg := make(chan string)
	var p *int
	var n int = 100
	p = &n
	go ping(msg, p)
	s := <-msg
	fmt.Println(s)
	fmt.Println("n = ", *p)
}