the-way-to-go_ZH_CN/eBook/examples/chapter_15/dial.go

// dial.go.go
package main

import (
	"fmt"
	"net"
	"os"
)

func main() {
	conn, err:= net.Dial("tcp", "192.0.32.10:80")
	checkConnection(conn, err)
	
	conn, err =net.Dial("udp", "192.0.32.10:80")
	checkConnection(conn, err)
	
	conn, err =net.Dial("tcp", "[2620:0:2d0:200::10]:80")
	checkConnection(conn, err)
}

func checkConnection(conn net.Conn, err error) {
	if err!= nil {
		fmt.Printf("error %v connecting!")
		os.Exit(1)
	}
			
	fmt.Println("Connection is made with %v", conn)

}