字符串和整数串联问题golang

Question

I am trying to write a port scanner in Go, i am facing few problems since i am new to this. Below is the code i have written till now.

package main

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

func main() {

    callme()

}

func callme() {

    var status string
    getip := os.Args[1]
    getport := 0
    for i := 0; i < 10; i++ {
        getport += i

        data := getip + ":" + getport
        conn, err := net.Dial("tcp", data)
        if err != nil {
            log.Println("Connection error:", err)
            status = "Unreachable"
        } else {

            status = getport + " - " + "Open"
            defer conn.Close()
        }

        fmt.Println(status)

    }
}

I take ip from user as a command line arg, and then want to scan all ports on this ip. Since the net.Dial function needs data in a format like "ip:port" i am kinda confused how to concat string and int each time. Can any1 help me achieve this ?

Answer 1

One possibility is using strconv.Itoa(getport) to convert the int into a string. Another possibility is formatting the string, as in fmt.Sprintf("%s:%d", getip, getport) or fmt.Sprintf("%d - Open", getport).