Different solution for Gophercise 1

1. Quiz Game Sol2/students/sewelol/main.go

@@ -0,0 +1,159 @@
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"math/rand"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// Problem structure
+type Problem struct {
+	q string
+	a int
+}
+
+// PROBLEMBUFCOUNT sets number of problems in buffer
+const PROBLEMBUFCOUNT = 100
+
+// DEFAULTTIMELIMIT sets the default time limit for the quiz
+const DEFAULTTIMELIMIT = 30 //seconds
+
+// Problem counter
+var count int
+
+// Score counter
+var score int
+var faults int
+
+// readProblems takes reads problems from file, line by line
+// problems are written to problems channel
+func readProblems(problems chan Problem, filename string, shuffle bool) {
+	// problems buffer
+	buf := make([]Problem, PROBLEMBUFCOUNT)
+
+	// Open problems file
+	fd, err := os.Open(filename)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer fd.Close()
+
+	// Scan file
+	scanner := bufio.NewScanner(fd)
+	for scanner.Scan() {
+		// Read comma separated line
+		line := strings.Split(scanner.Text(), ",")
+		// first value is the question string
+		q := line[0]
+		// Convert string answer to integer
+		ans, err := strconv.Atoi(line[1])
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		// store problem in buffer
+		buf[count] = Problem{q, ans}
+		count++
+	}
+
+	// shuffle problems
+	if shuffle {
+		rand.Seed(time.Now().Unix())
+		for i := range buf[:count] {
+			j := rand.Intn(i + 1)
+			buf[i], buf[j] = buf[j], buf[i]
+		}
+	}
+
+	// send problems over channel
+	for _, p := range buf[:count] {
+		problems <- p
+	}
+
+}
+
+// solveProblem consumes problems from chan
+// will check timer before giving points
+func solveProblem(problems chan Problem) {
+	// IO reader
+	scanner := bufio.NewScanner(os.Stdin)
+
+	// start consuming problems from channel
+	for p := range problems {
+
+		// Print problem question
+		fmt.Printf("%s = ", p.q)
+
+		// Scan IO
+		scanner.Scan()
+		input := strings.Trim(scanner.Text(), " ") // remove whitespace
+		// convert string answer to integer
+		givenAns, err := strconv.Atoi(input)
+		if err != nil {
+			fmt.Printf("'%s' is not a valid answer\n", input)
+			continue
+		}
+
+		// Check answer and give points
+		if givenAns == p.a {
+			score++
+			fmt.Println("Correct!")
+		} else {
+			faults++
+			fmt.Println("Wrong!")
+		}
+	}
+	return
+}
+
+// startTimer blocks for n seconds
+func startTimer(seconds int) {
+	time.Sleep(time.Duration(seconds) * time.Second)
+}
+
+func main() {
+	// Parse Command line flags
+	filenamePtr := flag.String("f", "problems.csv", "name of problem csv file")
+	secondsPtr := flag.Int("t", DEFAULTTIMELIMIT, "number of seconds to solve problems")
+	shufflePtr := flag.Bool("s", false, "shuffle questions")
+	debugPtr := flag.Bool("debug", false, "show debug information")
+	flag.Parse()
+
+	// Show debug/logging information
+	if !*debugPtr {
+		log.SetOutput(ioutil.Discard)
+	}
+	log.Println("debug:", *debugPtr)
+	log.Println("filename:", *filenamePtr)
+	log.Println("shuffle:", *shufflePtr)
+	log.Println("timer:", *secondsPtr)
+
+	// Problems channel (buffered)
+	problems := make(chan Problem, PROBLEMBUFCOUNT)
+
+	// read problems goroutine
+	go readProblems(problems, *filenamePtr, *shufflePtr)
+
+	// Prompt to start the game
+	fmt.Printf("Press any key to start the quiz!")
+	bufio.NewScanner(os.Stdin).Scan()
+
+	// solve problems goroutine
+	go solveProblem(problems)
+
+	// start timer barrier
+	startTimer(*secondsPtr)
+
+	// Show final tally
+	fmt.Printf("\nNumber of questions: %d\n", count)
+	fmt.Printf("Correct answers: %d\n", score)
+	fmt.Printf("Incorrect answers: %d\n", faults)
+
+}

1. Quiz Game Sol2/students/sewelol/problems.csv

@@ -0,0 +1,12 @@
+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