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                >[success] # 第一個應用程序 Hello World - 在 GOPATH/src 建一個 HelloWorld 項目目錄, 目錄下建一個 main.go 的入口文件 ![img](https://img.kancloud.cn/3e/2d/3e2d5f67546cf4c067b44d8426f832ff_680x305.png) - main.go 內容 ```go package main import "fmt" func main() { fmt.Println("Hello World 123") } ``` >[info] 編譯和執行 ![img](https://img.kancloud.cn/f0/88/f0887e226aa13d5702b26fb61f53004f_711x295.png) >[info] 說明 ```go //當前程序的包名(一個可執行程序只有一個 main 包) //一般建議package的名稱和目錄名保持一致 package main // 導入其它包 // 缺少或未使用的包,程序都無法編譯通過 // fmt是標準庫包, 用戶打印, 輸出等操作 // 更多Go標準庫包:https://studygolang.com/pkgdoc import "fmt" func main() { fmt.Println("Hello World 123") } ```
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