# Golang Learning Example-scissors games

Source: Internet
Author: User
This is a creation in Article, where the information may have evolved or changed.

Learned a golang, think should practice, wrote this scissors small game, go with the study went testing.

Main program source code:

`Package Mainimport ("Bufio"//input/output "FMT" "Math" "Math/rand" "OS" "StrConv" "Time")//rock, Paper, scissorsconst (Rock int = 1scissors int = 2paper int = 3rockName string = "Stone" scissorsname string = "Scissors" papername string = "cloth" Win int = 1 lose int = -1draw int = 0)//fist structure type Finger struct {value intname string}func createfinger (n int) (Finger Finger) {SWITC H N {case rock:finger.value = Rockfinger.name = Rocknamecase Scissors:finger.value = Scissorsfinger.name = Scissorsnamecas E Paper:finger.value = Paperfinger.name = Papername}return}func Isaiwin (ai finger, user finger) int {result: = Ai.value- user.value//if it is a comparison between a stone and a cloth, the comparison value is reversed if int (math. Abs (float64 (result)) = = Paper-rock {result =-(result)}if Result < 0 {return win} else if result > 0 {return lose}r Eturn Draw}func Randfinger () (finger finger) {rand: = rand. New (Rand. Newsource (time. Now (). Unixnano ())) switch Rand. INTN (3) {case 0:finger.value = Rockfinger.name = Rocknamecase 1:finger.value = Scissorsfinger.name = ScissorsnamEcase 2:finger.value = Paperfinger.name = Papername}return}func Main () {var aifinger, Userfinger FingerReader: = Bufio. Newreader (OS. Stdin) fmt. Printf ("Please input you want to punch:%d-> stone,%d-> scissors,%d-> cloth, 9-> exit \ n", rock, Scissors, paper) for {data, _, Err: = Reader. ReadLine () if err! = Nil {fmt. PRINTLN ("program error") Break}input, err: = StrConv. Atoi (String (data)) if err! = Nil {fmt. PRINTLN ("format wrong, enter Number:", input) continue}if input = = 9 {break}switch Input {case rock, scissors, Paper:aifinger = Randfinger ( ) FMT. PRINTLN ("Computer Punch for:", aifinger.name) Userfinger = Createfinger (input) fmt. Println ("You Punch for:", userfinger.name) Aiwin: = Isaiwin (Aifinger, userfinger) if Aiwin = = win {fmt. Println ("You lose, continue typing:")} else if Aiwin = = lose {fmt. Println ("You win, continue typing:")} else {fmt. Println ("Draw, continue to enter:")}default:fmt. PRINTLN ("Input not required, continue input:")}}}`

Testing source

`package mainimport ("testing"//Load Test Package) func Testcreatefinger (t *testing. T) {//the following struct as the initialization of map value cases: = Map[int]finger{rock:finger{rock, Rockname},scissors:finger{scissors, Scis Sorsname},paper:finger{paper, papername},6:finger{},//OTHER}FOR cs, except: = Range Cases {result: = Createf Inger (CS) if result! = except {T.errorf ("Case%v, except%v, result%v", CS, except, result)}}}func Testisaiwin (t *testing. T) {//the following struct as the initialization of the array element cases: = [...] struct {cs [2]intexcept int}{{[2]int{paper, Rock}, Win},{[2]int{rock, paper}, Lose},{[2]int{rock, scissors}, Win},{[2] Int{scissors, Rock}, Lose},{[2]int{scissors, paper}, Win},{[2]int{paper, scissors}, lose},{[2]int{scissors, scissors} , draw},}for I: = 0; I < Len (cases); i++ {cs: = cases[i].csexcept: = Cases[i].exceptresult: = Isaiwin (Createfinger (Cs[0]), Createfinger (Cs[1])) if result! = EX cept {T.errorf ("Case%v, except%v, result%v", CS, except, result)}}} `

Perform a preview

`Please enter the punch you want out of the:1-> stone,2-> scissors,3-> cloth, 9-> exit 3 computer punch for:  Stone you punch for:  cloth You won, continue to enter: 2 computer out fist:  cloth you punch for:  Scissors you win, continue to enter : 1 Computer punch for:  Stone you punch for: Stone  Draw, continue to enter: 1 computer punch for:  scissors you punch for:  Stone you win, continue to enter: 1 Computer out fist:  cloth you punch for:  Stone You lose, continue to enter: 9exit Code 0, process exited normally.`

In practice, there are a number of problems that are found, such as the long-appearing problem of missing types, such as
`Cases: = [...] struct {cs     [2]intexcept int}{{[2]int{paper, Rock}, Win},{[2]int{rock, paper}, Lose},{[2]int{rock, scissors}, win} , {[2]int{scissors, rock}, Lose},{[2]int{scissors, paper}, Win},{[2]int{paper, scissors}, Lose},{{scissors, scissors}, Draw},//originally conceived [2]int can be omitted, but in this case the semantic analysis fails, thus losing CS data }`

Some questions

If the import is separated (that is, there is a blank line in the middle), the FMT will not be swapped in order, and will not be affected by import.
`Import ("Bufio"//input/output "OS" "FMT" "StrConv" "Math" "Math/rand" "Time")`

If you don't separate, it will be.
`Import ("Bufio"//input/output "FMT" "Math" "Math/rand" "OS" "StrConv" "Time")`

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