Atharva Thorve | Command line quiz app using go

Author: AtharvaThorve

CMD Quiz App/README.md

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+# CMD Quiz App
+A simple quiz app on command line interface using golang
+
+# Packages used
+- encoding/csv
+- flag
+- fmt
+- os
+- strings
+- time
+
+# How to use the app
+Execute the `main.go` file using the `go run main.go` command.<br>
+By default the questions are provided from `problems.csv` file but the user can provide their own questions using the `--csv` flag then path to the file.<br>
+The user is given 30 seconds to complete the exercise but that time limit can also be changed by providing the `--limit` flag then the time limit of the test.<br>
+At the end of the test the user is shown the answers given, whether they were correct or not and the correct answer and the number of correct answers and the time taken by the user to complete the whole test.<br>
+User can use `-h` flag to know more about the flags in the program
+
+# Working
+- `flag` package is used to handle inputs from flags provided by the user.
+- `encoding/csv` package is used to read and parse csv files
+- `time` package and `channels` are used to maintain proper handling of time limits of the quiz

CMD Quiz App/src/main.go

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+package main
+
+import (
+	"encoding/csv"
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+)
+
+type problem struct {
+	question   string
+	answer     string
+	userAnswer string
+	isCorrect  bool
+}
+
+func main() {
+	csvFileName := flag.String("csv", "problems.csv", "A csv file of format 'question,answer'")
+	timeLimit := flag.Int("limit", 30, "The time limit of quiz in seconds")
+	flag.Parse()
+
+	file, err := os.Open(*csvFileName)
+	if err != nil {
+		exit(fmt.Sprintf("Could not open file %s\n", *csvFileName))
+	}
+	r := csv.NewReader(file)
+	lines, err := r.ReadAll()
+	if err != nil {
+		exit("Failed to parse the CSV file")
+	}
+	problems := parseLines(lines)
+
+	timer := time.NewTimer(time.Duration((*timeLimit)) * time.Second)
+	start := time.Now()
+
+	correctCount := 0
+problemloop:
+	for i := 0; i < len(problems); i++ {
+		fmt.Printf("Problem #%d: %s = ", i+1, problems[i].question)
+		ansChan := make(chan string)
+		go func() {
+			var answer string
+			fmt.Scanf("%s\n", &answer)
+			problems[i].userAnswer = answer
+			ansChan <- answer
+		}()
+
+		select {
+		case <-timer.C:
+			fmt.Println()
+			break problemloop
+		case answer := <-ansChan:
+			if answer == problems[i].answer {
+				problems[i].isCorrect = true
+				correctCount++
+			}
+		}
+	}
+	timer.Stop()
+	for i, prob := range problems {
+		check := "\u274C"
+		if prob.isCorrect {
+			check = "\u2705"
+		}
+		fmt.Printf("Problem #%d: %s = %s %s %s\n", i+1, prob.question, prob.userAnswer, string(check), prob.answer)
+	}
+
+	fmt.Printf("You scored %d out of %d in time %f seconds.\n", correctCount, len(problems), time.Since(start).Seconds())
+}
+
+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
+}
+
+func exit(msg string) {
+	fmt.Println(msg)
+	os.Exit(1)
+}

CMD Quiz App/src/problems.csv

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+5+5,10
+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