如何利用Go语言开发点餐系统的打印小票功能

package main

import (
    "fmt"
)

type Dish struct {
    Name  string
    Price float64
}

type Order struct {
    Dishes []Dish
    Table  int
}

func (o Order) PrintBill() {
    fmt.Printf("Table: %d
", o.Table)
    fmt.Println("-----------")
    fmt.Println("Dish        Price")
    for _, dish := range o.Dishes {
        fmt.Printf("%s        $%.2f
", dish.Name, dish.Price)
    }
    fmt.Println("-----------")
    fmt.Println("Total:        $", o.total())
}

func (o Order) total() float64 {
    total := 0.0
    for _, dish := range o.Dishes {
        total += dish.Price
    }
    return total
}

func main() {
    dish1 := Dish{Name: "Chicken Rice", Price: 8.0}
    dish2 := Dish{Name: "Beef Noodle", Price: 10.5}
    dish3 := Dish{Name: "Fish Soup", Price: 7.5}

    order := Order{
        Dishes: []Dish{dish1, dish2, dish3},
        Table:  6,
    }

    order.PrintBill()
}

Table: 6
-----------
Dish            Price
Chicken Rice    $8.00
Beef Noodle     $10.50
Fish Soup       $7.50
-----------
Total:          $26.00