main.go

package main

import (
	"encoding/csv"
	"flag"
	"fmt"
	"os"
	"strings"
	"time"
)
type problem struct{
	q string
	a string
}
func parseLines(lines [][]string) []problem{
	ret:=make([]problem, len(lines))
	for i,line:=range lines{
		ret[i]=problem{
			q:line[0],
			a:strings.TrimSpace(line[1]),
		}
	}
	return ret
}
func main(){
	csvFilename:=flag.String("csv", "problems.csv", "a csv file in the format of 'question, format'")
	timeLimit:=flag.Int("limit", 30, "the time limit for quiz in seconds")

	flag.Parse()
	file,err:=os.Open(*csvFilename)
	if err!=nil{
		exit(fmt.Sprintf("Failed to open the CSV file: %s\n", *csvFilename))
		os.Exit(1)
	}

	r:=csv.NewReader(file)
	lines,err:=r.ReadAll()
	if err!=nil{
		exit("Failed to parse the provided CSV file.")
	}
	problems:=parseLines(lines)
	timer:=time.NewTimer(time.Duration(*timeLimit) * time.Second)
	// <-timer.C

	correct:=0
problemloop:	
	for i,p:=range problems{
		fmt.Printf("Problem #%d: %s = ", i+1, p.q)
		answerCh:=make(chan string)
		go func(){
			var answer string
			fmt.Scanf("%s\n", &answer)
			answerCh<-answer
		}()
		select{
		case <-timer.C:
			fmt.Println()
			break problemloop
		case answer:=<-answerCh:
			if answer==p.a{
				correct++
			}
		}
		

	}
	fmt.Printf("You scored %d out of %d.\n", correct,len(problems))
}
func exit(msg string){
	fmt.Println(msg)
	os.Exit(1)
}