helloworld, var, const

.idea/workspace.xml

@@ -4,7 +4,11 @@
     <option name="autoReloadType" value="ALL" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="495445f0-1eca-47b4-946d-d66cf898be6c" name="Changes" comment="" />
+    <list default="true" id="495445f0-1eca-47b4-946d-d66cf898be6c" name="Changes" comment="">
+      <change afterPath="$PROJECT_DIR$/bilibili/src/go_code/project01/main/hello.go" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/bilibili/src/go_code/project02/main/main.go" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+    </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
     <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
@@ -18,6 +22,9 @@
     </option>
   </component>
   <component name="GOROOT" url="file:///usr/local/go" />
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+  </component>
   <component name="ProjectColorInfo">{
   &quot;associatedIndex&quot;: 7
 }</component>
@@ -28,12 +35,14 @@
   </component>
   <component name="PropertiesComponent"><![CDATA[{
   "keyToString": {
+    "ASKED_ADD_EXTERNAL_FILES": "true",
     "DefaultGoTemplateProperty": "Go File",
     "RunOnceActivity.ShowReadmeOnStart": "true",
     "RunOnceActivity.go.formatter.settings.were.checked": "true",
     "RunOnceActivity.go.migrated.go.modules.settings": "true",
     "RunOnceActivity.go.modules.automatic.dependencies.download": "true",
     "RunOnceActivity.go.modules.go.list.on.any.changes.was.set": "true",
+    "git-widget-placeholder": "main",
     "go.import.settings.migrated": "true",
     "go.sdk.automatically.set": "true",
     "last_opened_file_path": "/Users/chenqiang/workspace/study/go",

bilibili/src/const/test.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"fmt"
+)
+
+const (
+	// 可以在const()添加一个关键字iota，每行的iota都会累加1， 第一行的iota默认值是0
+	BEIJING = 10 * iota
+	SHANGHAI
+	SHENZHEN
+)
+
+const (
+	a, b = iota + 1, iota + 2 // iota = 0, a = 1, b = 2
+	c, d                      // iota = 1, c = 2, d = 3
+	e, f                      // iota = 2, e = 3, f = 4
+	g, h = iota * 2, iota * 3 // iota = 3, g = 3 * 2 = 6, h = 3 * 3 = 9
+	i, k                      // iota = 4, i = 4 * 2 = 8, k = 4 * 3 = 12
+)
+
+func main() {
+	// 常量（只读属性）
+	const length int = 10
+
+	fmt.Println("length = ", length)
+
+	fmt.Println("BEIJING = ", BEIJING)
+	fmt.Println("SHANGHAI = ", SHANGHAI)
+	fmt.Println("SHENZHEN = ", SHENZHEN)
+
+	fmt.Println("a = ", a, "b = ", b)
+	fmt.Println("c = ", c, "d = ", d)
+	fmt.Println("e = ", e, "f = ", f)
+	fmt.Println("g = ", g, "h = ", h)
+	fmt.Println("i = ", i, "k = ", k)
+}

bilibili/src/hello.go

@@ -0,0 +1,12 @@
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func main() {
+	fmt.Println("Hello Go!")
+
+	time.Sleep(1 * time.Second)
+}

bilibili/src/var/test.go

@@ -0,0 +1,60 @@
+package main
+
+/*
+四种声明变量的方式
+*/
+
+import (
+	"fmt"
+)
+
+var gA int = 100
+var gB = 200
+
+func main() {
+	// 方法一：声明一个亦是 默认的值是0
+	var a int
+	fmt.Println("a = ", a)
+	fmt.Printf("type of a is %T\n", a)
+
+	// 方法二：声明一个变量，初始化一个值
+	var b int = 100
+	fmt.Println("b = ", b)
+	fmt.Printf("type of b = %T\n", b)
+
+	var bb string = "abcd"
+	fmt.Printf("bb = %s\ntype of bb is %T\n", bb, bb)
+
+	// 方法三：在初始化的时候，可以省去数据类型，通过值自动匹配当前的变量的数据类型
+	var c = 100
+	fmt.Println("c = ", c)
+	fmt.Printf("type of c = %T\n", c)
+
+	var cc = "abcd"
+	fmt.Printf("cc = %s\ntype of cc is %T\n", cc, cc)
+
+	// 方法四：(常用的方法）省略var关键字，直接自动匹配，:=只能用在函数体内，不能用于声明全局变量
+	e := 100
+	fmt.Println("e = ", e)
+	fmt.Printf("type of e is %T\n", e)
+
+	g := 3.14
+	fmt.Println("g = ", g)
+	fmt.Printf("type of g is %T\n", g)
+
+	// ====
+	fmt.Println("gA = ", gA, ", gB = ", gB)
+
+	// 声明多个变量
+	var xx, yy int = 100, 200
+	fmt.Println("xx = ", xx, ", yy = ", yy)
+	var kk, ll = 100, "Alice"
+	fmt.Println("kk = ", kk, ", ll = ", ll)
+
+	// 多行多变量声明
+	var (
+		vv int  = 100
+		jj bool = true
+	)
+	fmt.Println("vv = ", vv, ", jj = ", jj)
+}

flysnow/.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

flysnow/.idea/flysnow.iml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="Go" enabled="true" />
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

flysnow/.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/flysnow.iml" filepath="$PROJECT_DIR$/.idea/flysnow.iml" />
+    </modules>
+  </component>
+</project>

flysnow/.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
+  </component>
+</project>