lesson10 + 11

Author: i-coder-robot

lesson10/book/book.go

@@ -0,0 +1,13 @@
+package book
+
+import "errors"
+
+func ShowBookInfo(bookName, authorName string) (string, error) {
+	if bookName == "" {
+		return "", errors.New("图书名称不能为空")
+	}
+	if authorName == "" {
+		return "", errors.New("作者名称不能为空")
+	}
+	return bookName + ",作者:" + authorName, nil
+}

lesson10/main.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"fmt"
+	"go_basic_edu/lesson10/book"
+	//"crypto/rand"
+	//mrand "math/rand"
+)
+
+//package packageName
+
+//import path
+//import(
+// path1
+// path2
+// ...
+//)
+
+func init() {
+	fmt.Println("init...")
+}
+
+func main() {
+	/*
+		包的初始化顺序
+		1 包级别的变量
+		2 init() 根据编译器解析的顺序进行调用
+
+		包的匿名导入
+		import _ 包名
+	*/
+
+	fmt.Println("《Go语言极简一本通》")
+	info, _ := book.ShowBookInfo("《Go语言极简一本通》", "欢喜")
+	fmt.Println(info)
+}