Go Language Tutorial Combat

This is a creation in Article, where the information may have evolved or changed.

Install the online tutorials

Because of the wall, golang.org domestic inaccessible, its online tutorial is the same tutorial.golang.org http://go-tour-zh.appspot.com/

Can be run on this machine,

First install the Go compiler http://code.google.com/p/go/downloads/list

Then install the tutorial

Go get Code.google.com/p/go-tour/gotour

or Chinese.

Go get Bitbucket.org/mikespook/go-tour-zh/gotour

the final execution of the installation results in gotour execute the file to open the tutorial in http://localhost:3999.

Some of the answers to the exercises

#46 Exercise: Fibonacci Closures

Package Mainimport the "FMT"//Fibonacci function returns a function that returns INT. Func Fibonacci () func () int {var a int = 1var b int = 1return func () int {c: = A+ba = BB = Creturn c}}func Main () {f: = fi Bonacci () for I: = 0; I < 10; i++ {fmt. Println (f ())}}

#69 Exercise: equivalent binary tree

Package Mainimport ("Bitbucket.org/mikespook/go-tour-zh/tree", "FMT")/*type tree struct {left  *treevalue intright * tree}*///Walk Step tree T sends all values from the tree to channel Ch. Func Walk (t *tree. Tree, ch Chan int) {if T! = Nil {Walk (t.left, ch) ch <-t.valuewalk (t.right, ch)}}//same detects if the tree T1 and T2 contain the same value. Func Same (t1, T2 *tree. Tree) bool {ch1: = make (chan int, ten) go Walk (T1, ch1) CH2: = Make (chan int, ten) go Walk (T2, CH2) for I: = 0; i <; i++ { If <-ch1! = <-ch2 {return False}}return True}func main () {FMT. Println (same, tree. New (1), tree. New (1))}

#57 Exercise: Error

Package Mainimport ("FMT") type errnegativesqrt Float64func (e errnegativesqrt) Error () string {return FMT. Sprintf ("Cannot Sqrt negative number:%f",  e)}func Sqrt (f float64) (Float64, error) {if f < 0 {return 0, Errnegativ Esqrt (f)}x: = ffor I: = 0; I < 10; i++ {x = (x + f/x)/2}return x, Nil}func main () {FMT. Println (SQRT (2)) fmt. Println (Sqrt (-2))}

#44 Exercise:Map

Package Mainimport (//"FMT" "Strings" "BITBUCKET.ORG/MIKESPOOK/GO-TOUR-ZH/WC") func WordCount (s string) map[string]int {result: = map[string]int {}f: = strings. Fields (s) for _, V: = range F {result[v] + = 1}return Result}func main () {WC. Test (WordCount)}