package main

import (
    "fmt"
)

func main(){
    var countryCapitalMap map[string]string =
        map[string]string{"France": "Paris",    "Italy": "Rome",
        "Japan": "Tokyo", "India": "New Delhi"}
    //countryCapitalMap = make(map[string]string)
    //countryCapitalMap["France"] = "Paris"
    //countryCapitalMap["Italy"] = "Rome"
    //countryCapitalMap["Japan"] = "Tokyo"
    //countryCapitalMap["India"] = "New Delhi"

    for country := range countryCapitalMap{
        fmt.Println(country, "首都是：", countryCapitalMap[country])
    }

    capital, ok := countryCapitalMap["USA"]
    if (ok) {
        fmt.Println("the capital of USA is: ", capital)
    }else{
        fmt.Println("not exist")
    }

    delete(countryCapitalMap, "France")
    fmt.Println(countryCapitalMap)

}