じーぴーえー (阪大koanフォーマット)

gpa.rb

# -*- encoding: utf-8 -*-
require "csv"

path = ARGV[0]
csv = CSV.read(path, headers: true, encoding: "Shift_JIS:UTF-8")

column = csv["評語"]
column.delete("欠席")

sum = column.reduce(0) do |memo, alphabet|
  val = {
    "\uFF33" => 4,
    "\uFF21" => 3,
    "\uFF22" => 2,
    "\uFf23" => 1
  }[alphabet]
  raise "Invaild val: " + alphabet.to_s if val.nil?
  memo + val
end

puts "Your GPA:" + (sum.to_f / column.length).to_s