// Homework 21, challenge: Percent. Solution.
//
// Run with: go run exercises/21/homework/solutions/04-percent.go

package main

import (
	"errors"
	"fmt"
	"strconv"
)

func parsePercent(text string) (int, error) {
	number, err := strconv.Atoi(text)
	if err != nil {
		return 0, err
	}
	if number < 0 || number > 100 {
		return 0, errors.New("percent must be 0 to 100")
	}
	return number, nil
}

func report(text string) {
	percent, err := parsePercent(text)
	if err != nil {
		fmt.Println("Error:", err)
		return
	}
	fmt.Println("Percent:", percent)
}

func main() {
	report("85")
	report("abc")
	report("150")
}