Hello World
7
Erlang [7] also shares some of the features of Go. Notable differences between Erlang and
Go is that Erlang borders on being a functional language, where Go is an imperative one.
And Erlang runs in a virtual machine, while Go is compiled. Go also has a much more
Unix-like feel to it.
Hello World
In the Go tutorial, Go is presented to the world in the typical manner: letting it print “Hello
World” (Ken Thompson and Dennis Ritchie started this when they presented the C lan-
guage in the 1970s). We don’t think we can do better, so here it is, “Hello World” in Go.
Listing 2.1. Hello world
1package main
..
0
3import "fmt" // Implements formatted I/O.
..
1
5/* Print something */
..
2
6func main() {
..
3
7
..
4
8fmt.Printf("Hello, world; or καληµ´ϵρα κóσµϵ; or こんにちは世界")
9}
Lets look at the program line by line.
..
0
This first line is just required. All Go files start with package <something>, package
main is required for a standalone executable;
..
1
This says we need fmt in addition to main. A package other than main is commonly
called a library, a familiar concept in many programming languages (see chapter 4).
The line ends with a comment which is started with //;
..
2
This is also a comment, but this one is enclosed in /* and */;
..
3
Just as package main was required to be first, import may come next. In Go, package
is always first, then import, then everything else. When your Go program is exe-
cuted, the first function called will be main.main(), which mimics the behavior from
C. Here we declare that function;
..
4
On line 8 we call a function from the package fmt to print a string to the screen. The
string is enclosed with " and may contain non-ASCII characters. Here we use Greek
and Japanese.
Compiling and running code
The preferred way to build a Go program is to use the go tool. To build helloworld we just
enter:
% go build helloworld.go
This results in an executable called helloworld.
剩余124页未读，继续阅读
Mrizzle
- 粉丝: 0
- 资源: 1
我的内容管理
展开
最新资源
- 计算机人脸表情动画技术发展综述
- 关系数据库的关键字搜索技术综述：模型、架构与未来趋势
- 迭代自适应逆滤波在语音情感识别中的应用
- 概念知识树在旅游领域智能分析中的应用
- 构建is-a层次与OWL本体集成：理论与算法
- 基于语义元的相似度计算方法研究：改进与有效性验证
- 网格梯度多密度聚类算法：去噪与高效聚类
- 网格服务工作流动态调度算法PGSWA研究
- 突发事件连锁反应网络模型与应急预警分析
- BA网络上的病毒营销与网站推广仿真研究
- 离散HSMM故障预测模型：有效提升系统状态预测
- 煤矿安全评价：信息融合与可拓理论的应用
- 多维度Petri网工作流模型MD_WFN：统一建模与应用研究
- 面向过程追踪的知识安全描述方法
- 基于收益的软件过程资源调度优化策略
- 多核环境下基于数据流Java的Web服务器优化实现提升性能
资源上传下载、课程学习等过程中有任何疑问或建议，欢迎提出宝贵意见哦~我们会及时处理！
点击此处反馈
