package main

import "fmt"

type Person struct {
	Name  string
	Age   int
	Email string
}

func (p Person) GetName() string {
	return ____
}

func (p Person) GetAge() int {
	return ____
}

func (p *Person) SetName(name string) {
	____ = ____
}

func (p *Person) SetEmail(email string) {
	____ = ____
}

func (p Person) GetInfo() string {
	return fmt.Sprintf("%s, %d岁, %s", ____, ____, ____)
}

type Rectangle struct {
	Width  float64
	Height float64
}

func (r Rectangle) Area() float64 {
	return ____
}

func (r *Rectangle) Resize(width, height float64) {
	____ = ____
	____ = ____
}

type BankAccount struct {
	Balance float64
	Owner   string
}

func (b *BankAccount) Deposit(amount float64) {
	b.Balance += ____
}

func (b *BankAccount) Withdraw(amount float64) bool {
	if b.Balance >= amount {
		b.Balance -= ____
		return ____
	}
	return false
}

func (b BankAccount) GetBalance() float64 {
	return ____
}

func exercise1() string {
	fmt.Println("=== 练习1：基础方法 ===")

	person := Person{Name: "张三", Age: 25, Email: "zhangsan@example.com"}

	name := ____
	age := ____

	person.SetName(____)
	person.SetEmail(____)

	fmt.Printf("姓名: %s, 年龄: %d\n", ____, person.Age)

	return ____
}

func exercise2() float64 {
	fmt.Println("=== 练习2：矩形方法 ===")

	rect := Rectangle{Width: 10, Height: 5}

	area := ____

	fmt.Printf("矩形面积: %.2f\n", area)

	rect.Resize(____, ____)

	newArea := ____
	fmt.Printf("调整后面积: %.2f\n", ____)

	return ____
}

func exercise3() float64 {
	fmt.Println("=== 练习3：银行账户方法 ===")

	account := BankAccount{Balance: 1000, Owner: "张三"}

	account.____(500)
	fmt.Printf("存款后余额: %.2f\n", account.____())

	success := account.____(300)
	if success {
		fmt.Printf("取款成功，余额: %.2f\n", account.____())
	}

	return ____
}

func exercise4() string {
	fmt.Println("=== 练习4：方法链 ===")

	// 使用方法链调用
	person := Person{Name: "李四", Age: 30, Email: "lisi@example.com"}

	person.SetName("李四（更新）").SetEmail("lisi_new@example.com")

	return ____
}

func exercise5() int {
	fmt.Println("=== 练习5：计算器方法 ===")

	type Calculator struct {
		value int
	}

	calc := Calculator{value: 0}

	calc.setValue := func(v int) {
		calc.value = v
	}

	calc.setValue(10)

	fmt.Printf("计算器值: %d\n", calc.value)

	return ____
}

func main() {
	fmt.Println("=== 方法 练习 ===\n")

	result1 := exercise1()
	fmt.Printf("练习1结果: %s\n", result1)

	result2 := exercise2()
	fmt.Printf("练习2结果: %.2f\n", result2)

	result3 := exercise3()
	fmt.Printf("练习3结果: %.2f\n", result3)

	result4 := exercise4()
	fmt.Printf("练习4结果: %s\n", result4)

	result5 := exercise5()
	fmt.Printf("练习5结果: %d\n", result5)
}