包管理【我的go学习第七课】

package db
type Item struct {
  Price float64
}
func LoadItem(id int) *Item {
  return &Item{
    Price: 9.001,
  }
}

package shopping
import (
  "shopping/db"
)
func PriceCheck(itemId int) (float64, bool) {
  item := db.LoadItem(itemId)
  if item == nil {
    return 0, false
  }
  return item.Price, true
}

package main
import (
  "shopping"
  "fmt"
)
func main() {
  fmt.Println(shopping.PriceCheck(4343))
}