Part 2 for Quiz Gophercise

quiz-part2.go

package main

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

func main() {
  var input = flag.String("input", "problems.csv", "CSV deliminited file, format: 'problem,answer'")
  var timeLimit = flag.Int("timeLimit", 30, "Time limit to answer each question.")
  flag.Parse()
  file, err := os.Open(*input)
  if err != nil {
    fmt.Printf("Error reading file: %s\n", err)
  }

  csv := csv.NewReader(file)
  q, err := csv.ReadAll()
  if err != nil {
    fmt.Printf("Error reading csv record: %s\n", err)
  }

  fmt.Printf("You'll have %d seconds between each question.  Press enter when ready.", *timeLimit)
  fmt.Scanf("\n")

  var correct int
  for i := 0; i < len(q); i++ {
    fmt.Printf("Question: %v: ", q[i][0])
    answerChannel := make(chan string)
    go func() {
      var userInput string
      fmt.Scanf("%s\n", &userInput)
      cleanInput := strings.TrimSpace(userInput)
      answerChannel <- cleanInput
    }()
    select {
    case cleanInput := <-answerChannel:
      if cleanInput == q[i][1] {
        fmt.Printf("Correct!\n")
        correct++
      } else {
        fmt.Printf("%v is incorrect, the answer is %v\n", cleanInput, q[i][1])
      }
    case <-time.After(time.Duration(*timeLimit) * time.Second):
      fmt.Printf("Times up! The answer is %v\n", q[i][1])
    }
  }
  fmt.Printf("You answered %d correctly out of %d\n", correct, len(q))
}