diff --git a/def.rb b/def.rb
new file mode 100644
index 0000000..84bd62d
--- /dev/null
+++ b/def.rb
@@ -0,0 +1,69 @@
+#!/uar/bin/env ruby
+# -*- coding: utf-8 -*-
+
+def kakunin(x)
+  printf("%s数を入力してね!\n",x)
+  kazu = gets.to_i
+end
+def kakezan(x,y)
+  x*y
+end
+
+def warizan(x,y)
+  x/y
+end
+
+def tasizan(x,y)
+  x+y
+end
+
+def hikizan(x,y)
+  x-y
+end
+
+def comment
+  puts"もう一度入力してね"
+end
+
+while true
+  
+  print"かけ算、割り算、足し算、引き算のうちどれかを選んでね!\n"
+  puts"1.かけ算"
+  puts"2.割り算"
+  puts"3.足し算"
+  puts"4.引き算"
+  puts"5.終わる"
+
+  go=gets.to_i
+  
+  if go==1
+    x = kakunin("かけられる")
+    y = kakunin("かける")
+    printf("答えは%dだよ!\n",kakezan(x,y))
+    redo
+
+  elsif go==2
+    x = kakunin("割られる")
+    y = kakunin("割る")
+    printf("答えは%dだよ!\n",warizan(x,y))
+    redo
+    
+  elsif go==3
+    x = kakunin("足される")
+    y = kakunin("足す")
+    printf("答えは%dだよ!\n",tasizan(x,y))
+    redo
+
+  elsif go==4
+    x = kakunin("引かれる")
+    y = kakunin("引く")
+    printf("答えは%dだよ!\n",hikizan(x,y))
+    redo
+    
+  elsif go==5
+    break
+
+  else
+    comment
+  end
+end
diff --git a/kibun.rb b/kibun.rb
new file mode 100644
index 0000000..d1a9b8b
--- /dev/null
+++ b/kibun.rb
@@ -0,0 +1,8 @@
+#!/usr/bin/env ruby
+# -*- coding:utf-8 -*-
+
+
+
+for i in kibun
+  printf("今日は%sをしたい気分だ。\n", kibun)
+end
diff --git a/koyakusu.rb b/koyakusu.rb
new file mode 100644
index 0000000..eed570e
--- /dev/null
+++ b/koyakusu.rb
@@ -0,0 +1,47 @@
+#!/usr/bin/env ruby
+#-*- coding:utf-8 -*-
+
+i = 1
+a = 1
+yakusu1=[]
+yakusu2=[]
+koyakusu = []
+
+puts"最大公約数を出します"
+puts"1つ目の数字を入力してください"
+suzi1 = gets.to_i
+puts"2つ目の数字を入力してください"
+suzi2 = gets.to_i
+
+while i <= suzi1
+  x = suzi1 % i
+  if x == 0
+    yakusu1<< i
+  end
+  i +=1
+end
+
+while a <= suzi2
+  y = suzi2 % a
+  if y == 0
+    yakusu2 << a
+  end
+  a +=1
+end
+
+i = 0
+
+while i != yakusu1.length
+  yakusu2.each do |n|
+    if yakusu1[i] == n
+      koyakusu << n
+    end
+  end
+  i +=1
+end
+
+if koyakusu.reverse[0] != nil
+  printf("%dと%dの最大公約数は%dです\n",suzi1,suzi2,koyakusu.reverse[0])
+else
+  printf("%dと%dに公約数はありません\n",suzi1,suzi2)
+end
diff --git a/kudamono.rb b/kudamono.rb
new file mode 100644
index 0000000..b510ac9
--- /dev/null
+++ b/kudamono.rb
@@ -0,0 +1,9 @@
+#!/usr/bin/env ruby
+# -*- coding: utf-8 -*-
+
+kudamono = ["りんご", "みかん", "バナナ"]
+nedan = [130, 80, 100]
+
+printf("%sの値段は%d円です。\n", kudamono[0], nedan[0])
+printf("%sの値段は%d円です。\n", kudamono[1], nedan[1])
+printf("%sの値段は%d円です。\n", kudamono[2], nedan[2])