main.go

package main

import (
	"encoding/csv"
	"flag"
	"fmt"
	"os"
	"strings"
	"time"
)

func main() {
	csvFilename := flag.String("csv", "problems.csv", "a csv file in the format of 'question,answer'")

	timeLimit := flag.Int("limit", 30, "the time limit for quiz in seconds")
	flag.Parse()
	_ = csvFilename

	file, err := os.Open(*csvFilename)

	if err != nil {
		exit(fmt.Sprintf("Failed to open the CSV file:%s\n", *csvFilename))

	}
	r := csv.NewReader(file)
	lines, err := r.ReadAll()
	if err != nil {
		exit("Failed to parse the provided CSV file")
	}
	correct := 0
	problems := parseLines(lines)

	timer := time.NewTimer(time.Duration(*timeLimit) * time.Second)

	for i, p := range problems {
		fmt.Printf("Problem #%d:%s = ", i+1, p.question)
		answerCh := make(chan string)
		go func() {
			var answer string
			fmt.Scanf("%s\n", &answer)
			answerCh <- answer
		}()
		select {
		case <-timer.C:
			fmt.Printf("\n You Scored %d out of %d.\n", correct, len(problems))
			return

		case answer := <-answerCh:
			if answer == p.answer {
				correct++
			}

		}

	}

}

// reading the lines and creating and array of the problem struct
func parseLines(lines [][]string) []problem {
	ret := make([]problem, len(lines))
	for i, line := range lines {
		ret[i] = problem{
			question: line[0],
			answer:   strings.TrimSpace(line[1]),
		}
	}

	return ret
}

// defining a a type to hold the question and answer
type problem struct {
	question string
	answer   string
}

// common function for handling errors
func exit(msg string) {
	fmt.Println(msg)
	os.Exit(1)
}