Add hellosputnik's solution (#9)

Author: hellosputnik

students/hellosputnik/main.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+)
+
+type Problem struct {
+	question string
+	answer   string
+}
+
+type Quiz struct {
+	problems []Problem
+	score    int
+}
+
+type Settings struct {
+	filename  *string
+	timeLimit *int
+}
+
+func main() {
+	quiz := Quiz{}
+	settings := Settings{}
+
+	settings.filename = flag.String("csv", "problems.csv", "a csv file in the format of 'question,answer'")
+	settings.timeLimit = flag.Int("limit", 30, "the time limit for the quiz in seconds")
+
+	// Get the flags (if any).
+	flag.Parse()
+
+	// Create a file handle for the file.
+	file, err := os.Open(*settings.filename)
+
+	// If there was an error opening the file, exit.
+	if err != nil {
+		panic(err)
+	}
+
+	defer file.Close()
+
+	// Create a buffered reader to read the file input.
+	fin := bufio.NewScanner(file)
+
+	// Read the problems from the comma-separated values file.
+	for fin.Scan() {
+		line := strings.Split(fin.Text(), ",")
+		problem := Problem{question: line[0], answer: line[1]}
+
+		quiz.problems = append(quiz.problems, problem)
+	}
+
+	// Create a timer to enforce a time limit.
+	timer := time.NewTimer(time.Second * time.Duration(*settings.timeLimit))
+	defer timer.Stop()
+
+	go func() {
+		<-timer.C
+		fmt.Printf("\nYou scored %d out of %d.", quiz.score, len(quiz.problems))
+	}()
+
+	// Quiz the user.
+	for i, problem := range quiz.problems {
+		fmt.Printf("Problem #%d: %s = ", (i + 1), problem.question)
+
+		var input string
+		fmt.Scan(&input)
+
+		if input == problem.answer {
+			quiz.score++
+		}
+	}
+
+	// Print the user's results.
+	fmt.Printf("You scored %d out of %d.", quiz.score, len(quiz.problems))
+}