Added siredmar's solution (#48)

Author: siredmar

students/siredmar/main.go

@@ -0,0 +1,108 @@
+package main
+
+import (
+	"bufio"
+	"encoding/csv"
+	"flag"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"os"
+	"strings"
+	"time"
+)
+
+var (
+	file  = flag.String("csv", "problems.csv", "a csv file in the format 'question,answer'")
+	limit = flag.Int("limit", 30, "the time limit for the quiz in seconds")
+)
+
+func main() {
+	flag.Parse()
+
+	if *limit < 0 {
+		fmt.Println("Error: enter positive time limit")
+		os.Exit(1)
+	}
+
+	records, err := read(*file)
+	if err != nil {
+		fmt.Println("Error: ", err)
+		os.Exit(1)
+	}
+
+	fmt.Println("Press enter to start. Time limit is", *limit, "seconds")
+	in := bufio.NewReader(os.Stdin)
+	in.ReadString('\n')
+
+	input := make(chan string)
+
+	quizdone := make(chan bool)
+	timeout := time.NewTicker(time.Duration(*limit) * time.Second)
+
+	go getInput(input)
+
+	var score int
+	var maxscore int
+
+	go func() {
+		maxscore = len(records)
+		for i, v := range records {
+			fmt.Print("Problem #", i+1, ": ", v[0], " = ")
+			text := <-input
+			if text == v[1] {
+				score++
+			}
+		}
+		quizdone <- true
+	}()
+
+	select {
+	case <-quizdone:
+	case <-timeout.C:
+		fmt.Println("\nThe time is up! Game over!")
+
+	}
+
+	fmt.Println("You scored", score, "out of", maxscore)
+}
+
+func read(filename string) ([][]string, error) {
+	dat, err := ioutil.ReadFile(filename)
+	r := csv.NewReader(strings.NewReader(string(dat)))
+	if err == nil {
+		var records [][]string
+		for {
+			record, err := r.Read()
+			if err == io.EOF {
+				break
+			}
+			if err != nil {
+				log.Fatal(err)
+			}
+			records = append(records, record)
+		}
+		return records, nil
+	}
+	return nil, err
+}
+
+func trim(s string) string {
+	t := strings.Trim(s, "\n")
+	t = strings.Trim(t, " ")
+	return t
+}
+
+func getInput(input chan<- string) {
+	for {
+		in := bufio.NewReader(os.Stdin)
+		result, err := in.ReadString('\n')
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		result = trim(result)
+		input <- result
+	}
+}

students/siredmar/problems.csv

@@ -0,0 +1,14 @@
+"What is the favourite food?",pizza
+5+5,10
+7+3,10
+1+1,2
+8+3,11
+1+2,3
+8+6,14
+3+1,4
+1+4,5
+5+1,6
+2+3,5
+3+3,6
+2+4,6
+5+2,7