лабораторная работа 7, Ткачёв Михаил

golang/lab7/car.go

@@ -0,0 +1,48 @@
+package lab7
+
+import "errors"
+
+var ErrColor error = errors.New("invalid color")
+var ErrMaxSpeed error = errors.New("the wrong maxSpeed value")
+
+type Color string
+
+const (
+	Red   Color = "красный"
+	Green Color = "зелённый"
+	White Color = "белый"
+	Black Color = "чёрный"
+)
+
+type car struct {
+	product
+	color    Color
+	maxSpeed float64
+}
+
+func (c *car) SetColor(color Color) error {
+	for _, standardColor := range []Color{Red, Green, White, Black} {
+		if color == standardColor {
+			c.color = color
+			return nil
+		}
+	}
+	return ErrColor
+}
+
+func (c *car) SetSpeed(maxSpeed float64) error {
+	if maxSpeed < 0 || maxSpeed > 250 {
+		return ErrMaxSpeed
+	}
+	c.maxSpeed = maxSpeed
+	return nil
+}
+
+func NewCar(id int, name string, price float64, color Color, maxSpeed float64) *car {
+	c := &car{
+		product: newProduct(id, name, price),
+	}
+	c.SetColor(color)
+	c.SetSpeed(maxSpeed)
+	return c
+}

golang/lab7/food.go

@@ -0,0 +1,12 @@
+package lab7
+
+type food struct {
+	product
+}
+
+func Newfood(id int, name string, price float64) *food {
+	f := &food{
+		product: newProduct(id, name, price),
+	}
+	return f
+}

golang/lab7/furniture.go

@@ -0,0 +1,37 @@
+package lab7
+
+import "errors"
+
+var ErrMaterial error = errors.New("invalid material")
+
+type Material string
+
+const (
+	Skin    Material = "кожа"
+	Wood    Material = "дерево"
+	Plywood Material = "Фанера"
+	Dsp     Material = "дсп"
+)
+
+type furniture struct {
+	product
+	material Material
+}
+
+func (f *furniture) SetMaterial(material Material) error {
+	for _, standardmaterial := range []Material{Skin, Wood, Plywood, Dsp} {
+		if material == standardmaterial {
+			f.material = material
+			return nil
+		}
+	}
+	return ErrMaterial
+}
+
+func NewFurniture(id int, name string, price float64, material Material) *furniture {
+	f := &furniture{
+		product: newProduct(id, name, price),
+	}
+	f.SetMaterial(material)
+	return f
+}

golang/lab7/lab7.go

@@ -0,0 +1,42 @@
+package lab7
+
+import (
+	"fmt"
+	"log"
+)
+
+func CompleteLab7() {
+	var err error
+
+	bentli := NewCar(0, "бентли", 100000, Red, 200)
+	sofa := NewFurniture(1, "диван", 1000, Skin)
+	chear := NewFurniture(2, "стул", 10, Wood)
+	cucumber := Newfood(3, "огурец", 5)
+
+	var ProductList []Product = []Product{
+		bentli,
+		sofa,
+		chear,
+		cucumber,
+	}
+
+	fmt.Printf("общяя стоимость товара до скидок: %v \n", GetTotalPrice(ProductList))
+	for _, product := range ProductList {
+		err = product.SetDiscount(10)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+	fmt.Printf("общяя стоимость товара после скидок в 10 процентов: %v \n", GetTotalPrice(ProductList))
+
+	err = bentli.SetColor(White)
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = sofa.SetMaterial(Plywood)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	displayListProducts(ProductList)
+}

golang/lab7/product.go

@@ -0,0 +1,43 @@
+package lab7
+
+import "errors"
+
+var ErrPercentageValue error = errors.New("the wrong percentage value")
+
+type product struct {
+	id       int
+	name     string
+	price    float64
+	discount float64
+}
+
+func (p product) GetPrice() float64 { return p.price }
+
+func (p product) GetName() string { return p.name }
+
+func (p product) GetDiscount() float64 { return p.discount }
+
+func (p *product) SetDiscount(percent float64) error {
+	if percent < 1 || percent > 100 {
+		return ErrPercentageValue
+	}
+	p.discount = percent
+
+	change := (p.price / 100) * percent
+
+	if change > p.price {
+		p.price = 0
+		return nil
+	}
+	p.price -= change
+	return nil
+}
+
+func newProduct(id int, name string, price float64) product {
+	return product{
+		id:       id,
+		name:     name,
+		price:    price,
+		discount: 0,
+	}
+}

golang/lab7/productInterface.go

@@ -0,0 +1,28 @@
+package lab7
+
+import "fmt"
+
+type Product interface {
+	SetDiscount(float64) error
+	GetDiscount() float64
+	GetPrice() float64
+	GetName() string
+}
+
+func displayListProducts(PList []Product) {
+	fmt.Println("____список товаров_____")
+	for _, p := range PList {
+		fmt.Printf(
+			"________________________\nтовар \"%v\" стоит %v$ благодоря скидке в %v процентов\n",
+			p.GetName(), p.GetPrice(), p.GetDiscount())
+	}
+}
+
+func GetTotalPrice(ProductList []Product) float64 {
+	var totalPrice float64
+
+	for _, product := range ProductList {
+		totalPrice += product.GetPrice()
+	}
+	return totalPrice
+}

golang/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 
+	"isuct.ru/informatics2022/lab7"
 	"isuct.ru/informatics2022/laba4"
 	"isuct.ru/informatics2022/laba6"
 )
@@ -12,4 +13,5 @@ func main() {
 
 	laba4.CompleteLaba4()
 	laba6.CompleteLaba6()
+	lab7.CompleteLab7()
 }