Kadai3-1 waytkheming

kadai3-1/waytkheming/.gitignore

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+### https://raw.github.com/github/gitignore/d2c1bb2b9c72ead618c9f6a48280ebc7a8e0dff6/Go.gitignore
+
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+

kadai3-1/waytkheming/README.md

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+
+# 【TRY】タイピングゲームを作ろう
+## ルール
+* 標準出力に英単語を出す（出すものは自由）
+* 標準入力から1行受け取る
+* 制限時間内に何問解けたか表示する
+
+## ヒント
+* 制限時間にはtime.After関数を用いる
+  * context.WithTimeoutでもよい
+* select構文を用いる
+  * 制限時間と入力を同時に待つ
+
+## 使い方
+```bash
+go run main.go
+```
+
+
+## オプション
+制限時間（秒）を指定可能
+```bash
+go run main.go -t 20
+```
+

kadai3-1/waytkheming/main.go

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+package main
+
+import (
+	"bufio"
+	"context"
+	"flag"
+	"fmt"
+	"io"
+	"math/rand"
+	"os"
+	"time"
+)
+
+func main() {
+	fmt.Println("TYPE THE WORD!")
+	questions := []string{"osaka", "tokyo", "mie", "aichi", "fukuoka", "nagano", "chiba", "shizuoka", "yamanashi"}
+
+	var score = 0
+
+	t := flag.Int("t", 10, "time limit")
+	flag.Parse()
+
+	bc := context.Background()
+	limit := time.Duration(*t) * time.Second
+	ctx, cancel := context.WithTimeout(bc, limit)
+	defer cancel()
+
+	ch := input(ctx, os.Stdout)
+
+LOOP:
+	for {
+
+		question := questions[rand.Intn(len(questions))]
+		fmt.Println(question)
+
+		select {
+		case <-ctx.Done():
+			fmt.Println("finish!!!")
+			break LOOP
+
+		default:
+			answer := <-ch
+			if answer == question {
+				fmt.Println("correct!!")
+				score++
+			} else {
+				fmt.Println("wrong!!")
+			}
+		}
+	}
+
+	fmt.Printf("your score is %v\n", score)
+}
+
+func input(ctx context.Context, r io.Reader) <-chan string {
+	ch := make(chan string)
+	go func() {
+		s := bufio.NewScanner(r)
+		for s.Scan() {
+			select {
+			case <-ctx.Done():
+				close(ch)
+				return
+			case ch <- s.Text():
+			}
+		}
+	}()
+	return ch
+}