// Chapter 20 example: read scores until the word done, then average them.
// Run with: go run exercises/20/03-sentinel.go

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func main() {
	reader := bufio.NewReader(os.Stdin)

	total := 0
	count := 0

	for {
		fmt.Print("Score from 1 to 100, or done: ")
		text, _ := reader.ReadString('\n')
		answer := strings.TrimSpace(text)
		if answer == "done" {
			break
		}

		score, _ := strconv.Atoi(answer)
		if score < 1 || score > 100 {
			fmt.Println("Skipped.")
			continue
		}

		total += score
		count++
	}

	if count > 0 {
		average := float64(total) / float64(count)
		fmt.Printf("%d scores, average %.2f\n", count, average)
	} else {
		fmt.Println("No scores entered.")
	}
}