diff --git "a/\043hello13.rb\043" "b/\043hello13.rb\043"
new file mode 100755
index 0000000..7543916
--- /dev/null
+++ "b/\043hello13.rb\043"
@@ -0,0 +1,13 @@
+#!/usr/bin/env ruby
+# -*- coding: utf-8 -*-
+require 'csv'
+CSV.open("output.csv", "w") do |csv|
+  csv << ["a", "b", "c"]
+  csv << [1, 2, 4]
+  csv << ["1", "1", "3", "0"]
+end
+data = CSV.read("output.csv", headers: true)
+
+data.each do |row|
+  printf("%s" + "%s")
+end
diff --git a/bun.csv b/bun.csv
new file mode 100644
index 0000000..6bf433f
--- /dev/null
+++ b/bun.csv
@@ -0,0 +1 @@
+おやつ何がいい,ポッキー
diff --git a/keisan7.rb b/keisan7.rb
new file mode 100755
index 0000000..ee351da
--- /dev/null
+++ b/keisan7.rb
@@ -0,0 +1,95 @@
+#!/usr/bin/env ruby
+# -*- coding: utf-8 -*-
+require "curses"
+def keisan(shiki, ichi=0, ans=0.0)
+  suuji=[]; enzan=[]; yuusen={'+'=>1,'-'=>1,'*'=>2,'/'=>2}
+  tekiyou = ->{
+    b=suuji.pop; a=suuji.pop; e=enzan.pop
+    suuji << (e=='+' ? a+b : e=='-' ? a-b : e=='*' ? a*b : a/b)
+  }
+  yomu_atai = lambda do
+    ichi += 1 while shiki[ichi]==' '
+    raise "式の途中で終わりました" unless shiki[ichi]
+    if shiki[ichi,3] && shiki[ichi,3].downcase=="ans"
+      next [ans, ichi+3]
+    end
+    if shiki[ichi]=='-'
+      ichi += 1
+      v, ichi = yomu_atai.call
+      next [-v, ichi]
+    end
+    if shiki[ichi]=='('
+      v, ichi2 = keisan(shiki, ichi+1, ans)
+      raise "閉じカッコ ) がありません" unless shiki[ichi2]==')'
+      next [v, ichi2+1]
+    end
+    hajime=ichi
+    ichi += 1 while shiki[ichi] && shiki[ichi]=~/[0-9.]/
+    raise "数値が見つかりません" if hajime==ichi
+    [shiki[hajime...ichi].to_f, ichi]
+  end
+  atai_hoshii=true
+  while ichi < shiki.length
+    ichi += 1 while shiki[ichi]==' '
+    break if ichi>=shiki.length || shiki[ichi]==')'
+    if atai_hoshii
+      v, ichi = yomu_atai.call
+      suuji << v
+      atai_hoshii=false
+      next
+    end
+    e=shiki[ichi]
+    raise "演算子が不正です" unless yuusen[e]
+    while enzan.any? && yuusen[enzan[-1]] && yuusen[enzan[-1]] >= yuusen[e]
+      tekiyou.call
+    end
+    enzan << e
+    ichi += 1
+    atai_hoshii=true
+  end
+  tekiyou.call while enzan.any?
+  [suuji[0], ichi]
+end
+
+include Curses
+init_screen
+cbreak
+noecho
+curs_set(0)
+nyuryoku=""; messeji="Enter=計算 / BS=削除 / Ctrl+L=クリア / q=終了"; kekka=""; ans=0.0
+begin
+  loop do
+    clear
+    setpos(0,0); addstr("curses電卓（+-*/() 小数）"[0,cols-1])
+    setpos(1,0); addstr(messeji[0,cols-1])
+    setpos(2,0); addstr(("> "+nyuryoku)[0,cols-1])
+    setpos(3,0); addstr(("= "+kekka)[0,cols-1])
+    key=getch
+    case key
+    when 'q','Q' then break
+    when 10,13
+      begin
+        shiki = nyuryoku.strip
+        shiki = ans.to_s if shiki.empty?
+        shiki = ans.to_s + shiki if shiki.start_with?('+','*','/')
+        kotae, owari = keisan(shiki, 0, ans)
+        owari += 1 while shiki[owari]==' '
+        raise "式の後ろに余計な文字があります" if owari < shiki.length
+        ans = kotae
+        kekka = kotae.to_s; nyuryoku=""; messeji="計算しました（ans=#{ans}）"
+      rescue => e
+        kekka = ""; nyuryoku=""; messeji="エラー: #{e.message}"
+      end
+    when 12
+      nyuryoku=""; kekka=""; messeji="クリアしました"
+    when KEY_BACKSPACE,127,8
+      nyuryoku = nyuryoku[0...-1]
+    when Integer
+      nyuryoku << key.chr if key>=32 && key<127
+    when String
+      nyuryoku << key if key.ord>=32 && key.ord<127
+    end
+  end
+ensure
+  close_screen
+end
diff --git a/random.rb b/random.rb
new file mode 100755
index 0000000..7385232
--- /dev/null
+++ b/random.rb
@@ -0,0 +1,57 @@
+#!/usr/bin/env ruby
+# -*- coding; utf-8 -*-
+require 'csv'
+data = CSV.read("bun.csv", headers: true)
+CSV.open("bun.csv", "w") do |csv|
+puts "ランダムに任せて適当に決めよう"
+puts "1.ランダムに答える 2.ランダムを作る"
+u = gets.chomp.to_i
+row = data.sample
+if u == 1
+  srand()
+  a = rand(3) + 1
+  if a == 1
+    printf("%s\n", row["1"])
+    kotae1 = row["1.5"]
+    kotae1n = gets.chomp
+    if kotae1n==kotae1
+      printf("正解!\n")
+    else
+      printf("不正解、答えは" kotae1 "でした")
+    end
+  end
+  if a == 2
+    printf("%s\n", row["2"])
+    kotae2 = ("%s\n", row["2.5"])
+    kotae2n = gets.chomp
+    if kotae2n==kotae2
+      printf("正解!\n")
+    else
+      printf("不正解、答えは\n" kotae2)
+    end
+  end
+  if a == 3
+    printf("%s\n", row["3"])
+    kotae3 = ("@s\n",row["3.5"])
+    kotae3n = gets.chomp
+    if kotae3n==kotae3
+      print("正解!\n")
+    else
+      printf("不正解、答えは %s でした\n" row["3.5"])
+    end
+  end
+elsif u == 2
+   print("使い方を見ますか? 1.見る 2.見ない\n")
+   tukaikata = gets.chomp
+   if tukaikata == 1
+     print("使い方は、1, 問題1, 1.5, 答え1, 2, 問題2, 2.5, 答え2,  3, 問題3, 3.5 答え3 1.5が打ち終わったらエンターキーを押すと改行されるので次の2.5とか3.5をそれでまた打ってください。\n")
+   end
+   print("問題を入れてください\n")
+   mondai1 = gets.chomp
+   csv << [mondai1]
+   mondai1 = gets.chomp
+   csv << [mondai1]
+   mondai1 = gets.chomp
+   csv << [mondai1]
+   print("問題が完成しました。")
+end
diff --git a/random2.rb b/random2.rb
new file mode 100644
index 0000000..b806962
--- /dev/null
+++ b/random2.rb
@@ -0,0 +1,35 @@
+require "csv"
+
+data = CSV.read("bun.csv")   # ← headers は使わない（Array前提）
+
+puts "1.ランダムに答える 2.問題を作る"
+u = gets.chomp.to_i
+
+if u == 1
+  row = data.sample          # row は Array
+  mondai = row[0]            # 問題
+  kotae  = row[1]            # 答え
+
+  puts mondai
+  print "答え: "
+  user = gets.chomp
+
+  if user == kotae
+    puts "正解!"
+  else
+    puts "不正解"
+    puts "正解は#{kotae}"
+  end
+
+elsif u == 2
+  print "問題: "
+  mondai = gets.chomp
+  print "答え: "
+  kotae = gets.chomp
+
+  CSV.open("bun.csv", "a") do |csv|
+    csv << [mondai, kotae]
+  end
+
+  puts "追加した"
+end