From 29dadd85fe91ebc311b51e11cbf3f7949ec1da88 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Wed, 3 Jul 2024 02:05:02 +0800
Subject: [PATCH] add concurrency

---
 Concurrency/Concurrency    |  9 ++++++++
 Concurrency/Concurrency.go |  5 +++++
 strconv/strconv            |  3 +++
 strconv/strconv.go         | 43 ++++++++++++++++++++++++++++++++++++++
 4 files changed, 60 insertions(+)
 create mode 100644 Concurrency/Concurrency
 create mode 100644 Concurrency/Concurrency.go
 create mode 100644 strconv/strconv
 create mode 100644 strconv/strconv.go

diff --git a/Concurrency/Concurrency b/Concurrency/Concurrency
new file mode 100644
index 0000000..25444cf
--- /dev/null
+++ b/Concurrency/Concurrency
@@ -0,0 +1,9 @@
+并发的介绍
+golang是天然支持高并发的语言
+并发：同一时间内执行多个任务
+并行：同一时刻执行多个任务
+
+golang的并发通过goroutine实现，goroutine是用户态的线程，由go的运行时runtime调度，而线程是通过操作系统去调度。
+最终还是放在操作系统的线程去执行，只不过管理（上下文切换）放在用户态，所以开销较小。
+
+golang提供channel用来在多个goroutine之间进行通信。
diff --git a/Concurrency/Concurrency.go b/Concurrency/Concurrency.go
new file mode 100644
index 0000000..7905807
--- /dev/null
+++ b/Concurrency/Concurrency.go
@@ -0,0 +1,5 @@
+package main
+
+func main() {
+
+}
diff --git a/strconv/strconv b/strconv/strconv
new file mode 100644
index 0000000..890422d
--- /dev/null
+++ b/strconv/strconv
@@ -0,0 +1,3 @@
+strconv标准库
+
+在golang这种强类型语言中，不支持不同类型的数据类型强制转换。
diff --git a/strconv/strconv.go b/strconv/strconv.go
new file mode 100644
index 0000000..bbbc89e
--- /dev/null
+++ b/strconv/strconv.go
@@ -0,0 +1,43 @@
+package main
+
+import (
+	"fmt"
+	"strconv"
+)
+
+func main() {
+	//从字符串解析出整形
+
+	str := "10000"
+	retInt64, err := strconv.ParseInt(str, 10, 64) //均转换成int64
+	if err != nil {
+		fmt.Println(err)
+	}
+	fmt.Printf("%v,%T\n", retInt64, retInt64)
+
+	//转换成int类型
+	retInt, _ := strconv.Atoi(str)
+	fmt.Printf("%v,%T\n", retInt, retInt)
+
+	//将数字转换成字符串类型
+
+	i := int32(97)
+	ret := fmt.Sprintf("%d", i)
+	fmt.Printf("%#v\n", ret)
+
+	//数字转换成字符串类型
+	iInt := int(i)
+	retStr := strconv.Itoa(iInt)
+	fmt.Printf("%#v\n", retStr)
+
+	//字符串转换成bool类型
+	boolstr := "true"
+	boolV, _ := strconv.ParseBool(boolstr)
+	fmt.Printf("%v,%T\n", boolV, boolV)
+
+	//字符串解析成浮点类型
+	floatstr := "1.234"
+	floatV, _ := strconv.ParseFloat(floatstr, 64)
+	fmt.Printf("%v,%T\n", floatV, floatV)
+
+}