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Go has pointers, but no pointer arithmetic.Struct fields can be accessed through a struct pointer. The indirection through the pointer is transparent.... 阅读全文
posted @ 2014-10-26 23:30
wuhn
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Struct fields are accessed using a dot.package main import "fmt"type Vertex struct { X int Y int}func main() { v := Vertex{1, 2} v.X = 4 ... 阅读全文
posted @ 2014-10-26 23:26
wuhn
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Astructis a collection of fields.(And atypedeclaration does what you'd expect.)package main import "fmt"type Vertext struct { X int Y int}func ... 阅读全文
posted @ 2014-10-26 23:24
wuhn
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As a simple way to play with functions and loops, implement the square root function using Newton's method.In this case, Newton's method is to approxi... 阅读全文
posted @ 2014-10-26 23:22
wuhn
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Variables declared inside anifshort statement are also available inside any of theelseblocks.package main import ( "fmt" "math")func pow(x, n, ... 阅读全文
posted @ 2014-10-26 23:06
wuhn
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Likefor, theifstatement can start with a short statement to execute before the condition.Variables declared by the statement are only in scope until t... 阅读全文
posted @ 2014-10-26 23:02
wuhn
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Theifstatement looks as it does in C or Java, except that the( )are gone and the{ }are required.(Sound familiar?)package main import ( "fmt" "m... 阅读全文
posted @ 2014-10-26 22:54
wuhn
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If you omit the loop condition it loops forever, so an infinite loop is compactly（简洁地；紧密地；细密地） expressed.package main func main() { for { ... 阅读全文
posted @ 2014-10-26 22:49
wuhn
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At that point you can drop the semicolons(分号): C'swhileis spelledforin Go.package main import "fmt"func main() { sum := 1 for sum < 1000 { ... 阅读全文
posted @ 2014-10-26 22:47
wuhn
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As in C or Java, you can leave the pre and post statements empty.package main import "fmt"func main() { sum := 1 for ; sum < 1000; { sum... 阅读全文
posted @ 2014-10-26 22:45
wuhn
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Go has only one looping construct, theforloop.The basicforloop looks as it does in C or Java, except that the( )are gone (they are not even optional) ... 阅读全文
posted @ 2014-10-26 22:42
wuhn
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Numeric constants are high-precisionvalues.An untyped constant takes the type needed by its context.Try printingneedInt(Big)too.package main import "f... 阅读全文
posted @ 2014-10-26 20:51
wuhn
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The expressionT(v)converts the valuevto the typeT.Some numeric conversions:var i int = 42var f float64 = float64(i)var u uint = uint(f)Or, put more si... 阅读全文
posted @ 2014-10-26 20:39
wuhn
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Go's basic types areboolstringint int8 int16 int32 int64uint uint8 uint16 uint32 uint64 uintptrbyte // alias for uint8rune // alias for int32 ... 阅读全文
posted @ 2014-10-26 20:08
wuhn
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Inside a function, the:=short assignment statement can be used in place of avardeclaration with implicit type.Outside a function, every construct begi... 阅读全文
posted @ 2014-10-26 20:02
wuhn
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A var declaration can include initializers, one per variable.If an initializer is present, the type can be omitted; the variable will take the type of... 阅读全文
posted @ 2014-10-26 19:55
wuhn
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Thevarstatement declares a list of variables; as in function argument lists, the type is last.package main import "fmt"var i intvar c, python, java bo... 阅读全文
posted @ 2014-10-26 19:53
wuhn
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A function can return any number of results.This function returns two strings.package mainimport "fmt"func swap(x, y string) (string, string) { ret... 阅读全文
posted @ 2014-10-26 19:47
wuhn
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import后面接的是目录的名字，而不是所谓包的名字，并且如果一个目录下面还有目录的话都必须要写进去，比如：import "MyPackage"import "MyPackage/MyInnerPackage"在这里讲明白了import后面接的是目录名而不是文件名更不是所谓的包名，那么一个目录下面的... 阅读全文
posted @ 2014-10-26 17:12
wuhn
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安装Go语言开发环境实例代码 - 详述Go语言安装所在需要的工作：安装C语言工具，安装Mercurial，更新go到新版本等操作实例。安装go环境1、简介Go是一个开源项目，采用BSD授权协议。 该文档介绍如何获取Go源代码，如何编译，以及如何运行Go程序。目前有两种方式使用Go语言。这里主要讲述如... 阅读全文
posted @ 2014-10-26 14:38
wuhn
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Go语言简介 - Go语言是由Google开发的一个开源项目，目的之一为了提高开发人员的编程效率。Go语言简介Go语言是由Google开发的一个开源项目，目的之一为了提高开发人员的编程效率。 Go语言语法灵活、简洁、清晰、高效。它对的并发特性可以方便地用于多核处理器和网络开发，同时灵活新颖的类型系统... 阅读全文
posted @ 2014-10-26 14:35
wuhn
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When running the command:+ mvn site site:stage -DskipTests -DskipTest -DskipITsyou get an error:[ERROR] Failed to execute goal org.apache.maven.plugin... 阅读全文
posted @ 2014-10-26 14:31
wuhn
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其实golang的工程管理还是挺简单的，完全使用目录结构还有package名来推导工程结构和构建顺序。当然，首先要说的是环境变量$GOPATH，项目构建全靠它。这么说吧，想要构建一个项目，就要将这个项目添加到$GOPATH中，多个项目用";"分隔。Golang项目目录下一般有三个子目录：src存放源... 阅读全文
posted @ 2014-10-26 11:11
wuhn
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原本不打算介绍GOPATH，然而，总是有初学者问一些关于GOPATH的问题，因此在这里再介绍一下GOPATHGOPATH环境变量用于指定这样一些目录：除$GOROOT之外的包含Go项目源代码和二进制文件的目录。go install和go 工具会用到GOPATH：作为编译后二进制的存放目的地和impo... 阅读全文
posted @ 2014-10-26 11:02
wuhn
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项目目录结构如何组织，一般语言都是没有规定。但Go语言这方面做了规定，这样可以保持一致性1、一般的，一个Go项目在GOPATH下，会有如下三个目录：|--bin|--pkg|--src其中，bin存放编译后的可执行文件；pkg存放编译后的包文件；src存放项目源文件。一般，bin和pkg目录可以不创... 阅读全文
posted @ 2014-10-26 10:59
wuhn
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