From 0e6a3b24f37a7a00ffe19446f710fee32208ef28 Mon Sep 17 00:00:00 2001
From: Wonder <hezhaohui0807@163.com>
Date: Tue, 17 Mar 2026 16:06:21 +0800
Subject: [PATCH] =?UTF-8?q?Finish:=2003-closures=20-=20=E9=97=AD=E5=8C=85?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 stage03-functions/03-closures/main.go | 48 +++++++++++++--------------
 1 file changed, 24 insertions(+), 24 deletions(-)

diff --git a/stage03-functions/03-closures/main.go b/stage03-functions/03-closures/main.go
index fe5fb0e..170a755 100644
--- a/stage03-functions/03-closures/main.go
+++ b/stage03-functions/03-closures/main.go
@@ -9,11 +9,11 @@ func exercise1() func(int) int {
 	// 该闭包接收一个int参数并返回乘以multiplier的结果
 
 	multiplier := 3
-	____ := func(num int) ____ {
-		return ____
+	multifunc := func(num int) int {
+		return multiplier * num
 	}
 
-	return ____
+	return multifunc
 }
 
 func exercise2() func() int {
@@ -23,14 +23,14 @@ func exercise2() func() int {
 	// 每次调用返回的函数时，计数器加1
 	// 提示：使用匿名函数捕获外部变量
 
-	count := ____
+	count := 0
 
-	____ := func() ____ {
-		____
-		return ____
+	countfunc := func() int {
+		count++
+		return count
 	}
 
-	return ____
+	return countfunc
 }
 
 func exercise3() func() int {
@@ -40,15 +40,15 @@ func exercise3() func() int {
 	// 每次调用返回下一个斐波那契数
 	// 数列: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34...
 
-	a, b := ____, ____
+	a, b := 0, 1
 
-	____ := func() ____ {
-		result := ____
-		a, b = ____
-		return ____
+	fib := func() int {
+		result := a
+		a, b = b, a+b
+		return result
 	}
 
-	return ____
+	return fib
 }
 
 func exercise4() func(int) bool {
@@ -59,13 +59,13 @@ func exercise4() func(int) bool {
 	// 检查函数判断输入数字是否在[min, max]范围内
 
 	min := 10
-	max := ____
+	max := 20
 
-	____ := func(num int) ____ {
-		return num >= ____ && num <= ____
+	check := func(num int) bool {
+		return num >= min && num <= max
 	}
 
-	return ____
+	return check
 }
 
 func exercise5(start int) func(int) int {
@@ -75,18 +75,18 @@ func exercise5(start int) func(int) int {
 	// 从start开始，每次调用累加参数值
 	// 提示：闭包应该能访问外部作用域的变量
 
-	total := ____
+	total := start
 
-	____ := func(n int) ____ {
-		____
-		return ____
+	adder := func(n int) int {
+		total += n
+		return total
 	}
 
-	return ____
+	return adder
 }
 
 func main() {
-	fmt.Println("=== 闭包 练习 ===\n")
+	fmt.Println("=== 闭包 练习 ===")
 
 	add3 := exercise1()
 	fmt.Printf("练习1结果: add3(4) = %d\n", add3(4))