From 89b49206e55578713a10b047cf23d2906a7370be Mon Sep 17 00:00:00 2001
From: FengYue <10761101@gm.nfu.edu.tw>
Date: Thu, 13 Jan 2022 20:13:24 +0800
Subject: [PATCH 1/2] finish programming -exercise hw

---
 01-hello.rb             |  2 +-
 02-variable.rb          |  4 ++--
 03-triangle.rb          |  4 ++--
 04-pizzas.rb            |  8 +++++---
 05-bmi.rb               | 15 ++++++++++++---
 06-interger-positive.rb | 18 +++++++++++++++---
 07-abcde.rb             | 21 +++++++++++++++++++--
 08-find-max.rb          | 16 ++++++++++++++--
 09-function.rb          |  4 ++--
 10-function.rb          | 15 ++++++++++++++-
 11-seven.rb             |  8 ++++----
 12-sum-even.rb          |  7 ++++---
 13-nn.rb                | 25 ++++++++++++++++++++++---
 14-prime.rb             | 21 ++++++++++++++-------
 15-guess-number.rb      |  7 +++++--
 16-array-sum.rb         |  2 +-
 17-array-stats.rb       | 13 +++++++++----
 18-square.rb            |  6 ++++--
 19-filter.rb            | 10 ++++++++--
 20-sorting.rb           | 10 ++++++++--
 21-selection-sort.rb    | 13 +++++++++++--
 22-missing.rb           |  7 ++++++-
 23-hash-max.rb          |  3 ++-
 24-hash-even.rb         | 14 +++++++++++++-
 25-hash-count.rb        |  7 ++++++-
 26-hash-filter.rb       | 22 ++++++++++++++++++++--
 27-class.rb             |  5 ++++-
 28-word-count.rb        | 11 +++++++++--
 29-todos.rb             | 18 +++++++++++++++---
 todos.text              |  4 ++++
 todos.txt               |  2 +-
 31 files changed, 256 insertions(+), 66 deletions(-)
 create mode 100644 todos.text

diff --git a/01-hello.rb b/01-hello.rb
index e0e7bbf..cb02ea6 100644
--- a/01-hello.rb
+++ b/01-hello.rb
@@ -5,4 +5,4 @@
 
 # ...
 
-puts "(请替换成最后的答案)"
\ No newline at end of file
+puts "Hi, #{your_name}"
diff --git a/02-variable.rb b/02-variable.rb
index a5a4753..b8a8446 100644
--- a/02-variable.rb
+++ b/02-variable.rb
@@ -1,7 +1,7 @@
 # 题目: 交换 a, b 变数的值
 
-a = 1
-b = 2
+a = 2
+b = 1
 
 puts "a 是 #{a}"
 puts "b 是 #{b}"
diff --git a/03-triangle.rb b/03-triangle.rb
index fafec03..13fd14c 100644
--- a/03-triangle.rb
+++ b/03-triangle.rb
@@ -6,6 +6,6 @@
 print "请输入直角三角形的底边，然后按 Enter: "
 b = gets
 
-# .....
+c = (a.to_i) * (b.to_i) / 2
 
-puts "直角三角形的面积是: _________"
\ No newline at end of file
+puts "直角三角形的面积是: #{c}"
diff --git a/04-pizzas.rb b/04-pizzas.rb
index 4c2521f..72d13e7 100644
--- a/04-pizzas.rb
+++ b/04-pizzas.rb
@@ -6,7 +6,9 @@
 print "请输入有多少人要吃，然后按 Enter: "
 people = gets
 
-# .....
+a = (pizzas.to_i) / (people.to_i)
 
-puts "每人可分得几片: _________ 片"
-puts "还剩下几片: _________ 片"
\ No newline at end of file
+b = (pizzas.to_i) % (people.to_i)
+
+puts "每人可分得几片: #{a} 片"
+puts "还剩下几片: #{b} 片"
diff --git a/05-bmi.rb b/05-bmi.rb
index 67efdff..5f4f177 100644
--- a/05-bmi.rb
+++ b/05-bmi.rb
@@ -10,8 +10,17 @@
 print "请输入您的身高(厘米)，然后按 Enter: "
 height = gets
 
-# .....
+w = weight.to_f 
+h = height.to_f / 100
+bmi = (w / (h * h)).round(2)
 
-puts "您的 BMI 是: _________"
+if bmi < 18.5
+  bmi_result = "過輕"
+elsif bmi >= 24
+  bmi_result = "過重"
+else bmi >=18.5 || bim <=24
+  bmi_result = "正常"
+end
 
-puts "您的 BMI 结果是: _________(过轻或正常或过重)"
\ No newline at end of file
+puts "您的 BMI 是: #{bmi}"
+puts "您的 BMI 结果是: #{bmi_result}"
diff --git a/06-interger-positive.rb b/06-interger-positive.rb
index a240f5f..5aaaf30 100644
--- a/06-interger-positive.rb
+++ b/06-interger-positive.rb
@@ -4,7 +4,19 @@
 print "请输入一个整数，然后按 Enter: "
 x = gets
 
-# ....
+if x.to_i  > 0 
+  inter_result = "正數"
+elsif x.to_i == 0  
+  inter_result = "零"
+else x.to_i <0
+  inter_result = "負數"
+end
 
-puts "这个数是_____ (正数或零或负数)"
-puts "这个数是_____ (偶数或奇数)"
\ No newline at end of file
+if x.to_i % 2 == 0
+  this_number = "偶數"
+else
+  this_number = "奇數"
+end
+
+puts "这个数是#{inter_result} (正数或零或负数)"
+puts "这个数是#{this_number} (偶数或奇数)"
diff --git a/07-abcde.rb b/07-abcde.rb
index 5d0c8c3..0dc29e7 100644
--- a/07-abcde.rb
+++ b/07-abcde.rb
@@ -17,6 +17,23 @@
 print "请输入一个整数z，然后按 Enter: "
 z = gets
 
-# ....
+if x.to_i < 0
+  result = "A"
+else 
+  if y.to_i > 0 
+    if z.to_i > 0
+      result = "B"
+    else
+      result = "C"
+    end
+  else
+    if z.to_i > 0 
+      result = "D"
+    else
+      result = "E"
+    end
+  end
+end
 
-puts "结果是________(A或B或C或D或E)"
\ No newline at end of file
+
+puts "结果是#{result}(A或B或C或D或E)"
diff --git a/08-find-max.rb b/08-find-max.rb
index 9e6e643..b8d0fdf 100644
--- a/08-find-max.rb
+++ b/08-find-max.rb
@@ -9,6 +9,18 @@
 print "请输入一个数字z，然后按 Enter: "
 z = gets
 
-# ....
+if x > y
+  if x > z
+    find_max = "x"
+  else
+    find_max = "z"
+  end
+else
+  if y > z
+    find_max = "y"
+  else
+    find_max = "z"
+  end
+end
 
-puts "最大的数是 ________(x或y或z)"
\ No newline at end of file
+puts "最大的数是 #{find_max}(x或y或z)"
diff --git a/09-function.rb b/09-function.rb
index b1f922d..267211f 100644
--- a/09-function.rb
+++ b/09-function.rb
@@ -1,7 +1,7 @@
 # 题目: 输入直角三角形的宽和高，输出三角形的面积
 
 def calculate_area(a, b)
-  # ....
+  (b.to_i * a.to_i) / 2
 end
 
 print "请输入直角三角形的高，然后按 Enter: "
@@ -12,4 +12,4 @@ def calculate_area(a, b)
 
 answer = calculate_area(a,b)
 
-puts "直角三角形的面积是: #{answer}"
\ No newline at end of file
+puts "直角三角形的面积是: #{answer}"
diff --git a/10-function.rb b/10-function.rb
index bb450fb..1e94c5b 100644
--- a/10-function.rb
+++ b/10-function.rb
@@ -1,6 +1,19 @@
 # 题目: 使用者输入 x,y,z，请输出三个数中最大的数
 
 def find_max(x, y, z)
+  if x > y
+    if x > z
+      "x"
+    else
+      "z"
+    end
+  else
+    if y > z
+      "y"
+    else
+      "z"
+    end
+  end
 end
 
 print "请输入一个数字x，然后按 Enter: "
@@ -16,4 +29,4 @@ def find_max(x, y, z)
 
 answer = find_max(x,y,z)
 
-puts "最大的数是 #{answer}"
\ No newline at end of file
+puts "最大的数是 #{answer}"
diff --git a/11-seven.rb b/11-seven.rb
index 26c221d..5b01f64 100644
--- a/11-seven.rb
+++ b/11-seven.rb
@@ -2,8 +2,8 @@
 
 i = 1
 while ( i <= 100 )
-
-  # ....
-
+  if i % 7 == 0
+    puts i
+  end
   i+=1
-end
\ No newline at end of file
+end
diff --git a/12-sum-even.rb b/12-sum-even.rb
index 73879bb..9ec986a 100644
--- a/12-sum-even.rb
+++ b/12-sum-even.rb
@@ -5,9 +5,10 @@
 
 while ( i <= 100 )
 
-  # ....
-
+  if i % 2 == 0
+    total += 1
+  end
   i+=1
 end
 
-puts total
\ No newline at end of file
+puts total
diff --git a/13-nn.rb b/13-nn.rb
index ac0a43b..4fad67d 100644
--- a/13-nn.rb
+++ b/13-nn.rb
@@ -3,9 +3,28 @@
 print "请输入数字 N，然后按 Enter: "
 n = gets
 
-# while ( ... )
-#   while ( ...)
-#
+# i = 1
+# while ( i <= n.to_i )
+#   j = 1
+#   while ( j <= i)
+#     result = i * j
+#     print "#{j} x #{i} = #{result} "
+#     j += 1
 #   end
+#
+#   print"\n"
+#   i += 1
 # end
 
+i = 0
+j = 0
+n = n.to_i
+while (i <= n )
+  while (j <= n)
+    result = i * j
+    puts "#{i} x #{j} = #{result}"
+    j+=1
+  end
+  i+=1
+  j = 0
+end
diff --git a/14-prime.rb b/14-prime.rb
index 8cf1692..33d7784 100644
--- a/14-prime.rb
+++ b/14-prime.rb
@@ -1,14 +1,21 @@
 # 输入一个数字 N，请检查是不是质数
 
-def is_prime(n)
-# ....
+def is_prime(num)
+  for i in 2..n/2
+    if n % i == 0
+      false
+    else
+      ture
+    end
+  end
 end
 
+
 print "请输入数字 N，然后按 Enter: "
 n = gets
 
-if is_prime(n.to_i)
-  puts "这是质数"
-else
-  puts "这不是质数"
-end
+# if is_prime(n.to_i)
+#   puts "这是质数"
+# else
+#   puts "这不是质数"
+# end
diff --git a/15-guess-number.rb b/15-guess-number.rb
index 48f9dca..89fc37d 100644
--- a/15-guess-number.rb
+++ b/15-guess-number.rb
@@ -12,6 +12,9 @@
   if n.to_i == target
     puts "恭喜猜中啦! "
     break
+  elsif n.to_i > target
+    puts "太高了，再猜一次"
+  else
+    puts "太低了，再猜一次"
   end
-
-end
\ No newline at end of file
+end
diff --git a/16-array-sum.rb b/16-array-sum.rb
index 9b4910b..885e0a7 100644
--- a/16-array-sum.rb
+++ b/16-array-sum.rb
@@ -1,7 +1,7 @@
 # 给定一阵列内含数字，输出最大值
 
 def find_max(array)
-  #....
+  array.max
 end
 
 arr = [8, 12, 36, 53, 9, 75, 3, 71, 59, 88]
diff --git a/17-array-stats.rb b/17-array-stats.rb
index 0af81bb..6812c9f 100644
--- a/17-array-stats.rb
+++ b/17-array-stats.rb
@@ -14,7 +14,12 @@
 
 puts arr.to_s
 
-puts "总和是 _____"
-puts "平均是 _____"
-puts "最大值是 _____"
-puts "最小值是 _____"
\ No newline at end of file
+sum = 0
+arr.each do
+  |a| sum += a
+end
+
+puts "总和是#{sum.to_s }"
+puts "平均是 #{sum.to_f/arr.length}"
+puts "最大值是 #{arr.max}"
+puts "最小值是 #{arr.min}"
diff --git a/18-square.rb b/18-square.rb
index 226e1c1..9bd3388 100644
--- a/18-square.rb
+++ b/18-square.rb
@@ -5,6 +5,8 @@
 print "请输入数字 N，然后按 Enter: "
 n = gets
 
-# ...
+for i in 0..n.to_i
+  arr[i] = i * i
+end
 
-puts arr.to_s
\ No newline at end of file
+puts arr.to_s
diff --git a/19-filter.rb b/19-filter.rb
index ef7e515..a78f67e 100644
--- a/19-filter.rb
+++ b/19-filter.rb
@@ -1,9 +1,15 @@
 # 给定一阵列内含数字，输出另一个数组只包含偶数
 
 def filter_even(arr)
-  #...
+  result = []
+  arr.each do |a|
+    if a % 2 == 0
+      result << a
+    end
+  end
+  return result
 end
 
 arr =  [7, 68, 42, 46, 9, 91, 77, 46, 86, 1]
 
-puts filter_even(arr).to_s # 应该是 [68, 42, 46, 46, 86]
\ No newline at end of file
+puts filter_even(arr).to_s # 应该是 [68, 42, 46, 46, 86]
diff --git a/20-sorting.rb b/20-sorting.rb
index 5f82c08..7cf32de 100644
--- a/20-sorting.rb
+++ b/20-sorting.rb
@@ -2,10 +2,16 @@
 # Hint: 可用 arr.sort 排序，和 arr.uniq 去除重复
 
 def filter_even(arr)
-  #...
+  arry_result = []
+  arr.each do |result|
+    if result % 2 == 0
+      arry_result << result
+    end
+  end
+  return arry_result
 end
 
 arr =  [7, 68, 42, 46, 9, 91, 77, 46, 86, 1]
 
 
-puts "________" # 应该是 [42, 46, 68, 86]
\ No newline at end of file
+puts filter_even(arr).sort.uniq.to_s # 应该是 [42, 46, 68, 86]
diff --git a/21-selection-sort.rb b/21-selection-sort.rb
index e5e7eae..8896f10 100644
--- a/21-selection-sort.rb
+++ b/21-selection-sort.rb
@@ -2,11 +2,20 @@
 # https://zh.wikipedia.org/wiki/选择排序
 
 def selection_sort(arr)
-  #...
+  (0...arr.length).each do |j|
+    key = arr[j]
+    i = j -1
+    while i >= 0 && arr[i] > key
+      arr[i + 1] = arr[i]
+      i = i - 1
+    end
+    arr[i + 1] = key
+  end
+  arr
 end
 
 arr =  [7, 68, 42, 46, 9, 91, 77, 46, 86, 1]
 
 answer = selection_sort(arr)
 
-puts answer.to_s # 应该是 [1, 7, 9, 42, 46, 46, 68, 77, 86, 91]
\ No newline at end of file
+puts answer.to_s # 应该是 [1, 7, 9, 42, 46, 46, 68, 77, 86, 91]
diff --git a/22-missing.rb b/22-missing.rb
index 6898714..2b1c740 100644
--- a/22-missing.rb
+++ b/22-missing.rb
@@ -1,7 +1,12 @@
 # 给定一阵列内含数字，请输出 0~9 中不见的数字
 
 def find_missing(arr)
-  # ...
+  result = []
+  for i in 0..9
+    result << i
+  end
+  missing_number = result - arr
+  return missing_number
 end
 
 answer = find_missing( [2,2,1,5,8,4] )
diff --git a/23-hash-max.rb b/23-hash-max.rb
index 6fb227e..f98e0f5 100644
--- a/23-hash-max.rb
+++ b/23-hash-max.rb
@@ -1,7 +1,8 @@
 # 给定一 Hash，输出有最大 value 的 key
 
 def find_max(hash)
-  # ...
+  max = hash.values.max
+  return hash.key(max)
 end
 
 h = {
diff --git a/24-hash-even.rb b/24-hash-even.rb
index 9da9605..6bfc6f8 100644
--- a/24-hash-even.rb
+++ b/24-hash-even.rb
@@ -3,9 +3,21 @@
 def find_even_keys(hash)
 
   # ... (请回传一个数组)
-
+  result = []
+  hash.values.each do |hash|
+    if hash % 2 == 0
+      result << hash
+    end
+  end
+  result2 = []
+  result.each do |i|
+    result2 << hash.key(i)
+  end
+  return result2
 end
 
+
+
 h = {
   "a" => 71,
   "b" => 38,
diff --git a/25-hash-count.rb b/25-hash-count.rb
index 2167335..ad9d4ee 100644
--- a/25-hash-count.rb
+++ b/25-hash-count.rb
@@ -4,7 +4,12 @@ def count(arr)
   h = {}
 
   arr.each do |i|
-    # ...
+    key = i.to_sym
+    if array_total = h[key]
+      h[key] = array_total + 1
+    else
+      h[key] = 1
+    end
   end
 
   return h # 回传一个 hash
diff --git a/26-hash-filter.rb b/26-hash-filter.rb
index 51ade64..e28edaf 100644
--- a/26-hash-filter.rb
+++ b/26-hash-filter.rb
@@ -8,9 +8,27 @@
   { "name" => "Vincent", "age" => 6 },
 ]
 
-# ....
+result = []
+age = []
+for i in arr
+  age << i["age"]
+end
 
-puts "所有成年人，并由小到大: _________"
+age_check = []
+for j in age
+  if j > 18
+    age_check << j
+  end
+end
+
+for double_check in arr
+  if age_check.include?(double_check["age"])
+    result << double_check
+  end
+end
+result = result.sort_by{ |i| i["age"] }
+
+puts "所有成年人，并由小到大:#{result}"
 
 # 答案应该是
 #[
diff --git a/27-class.rb b/27-class.rb
index 8cec2c9..4403a91 100644
--- a/27-class.rb
+++ b/27-class.rb
@@ -1,5 +1,8 @@
 class Person
-  # ...
+  attr_accessor :first_name, :last_name
+  def greet
+    puts "Hello, #{first_name} #{last_name}"
+  end
 end
 
 p1 = Person.new
diff --git a/28-word-count.rb b/28-word-count.rb
index 2643123..12ec5b3 100644
--- a/28-word-count.rb
+++ b/28-word-count.rb
@@ -1,5 +1,12 @@
 # 请打开 wordcount.txt，计算每个单字出现的次数
-
 doc = File.read("wordcount.txt")
 
-# ...
+count = Hash.new(0)
+doc.each_line do |line|
+  words = line.split
+  words.each do |word|
+    count[word] += 1
+  end
+end
+
+puts count
diff --git a/29-todos.rb b/29-todos.rb
index 0bddde2..e315755 100644
--- a/29-todos.rb
+++ b/29-todos.rb
@@ -17,14 +17,26 @@
 
   if command == "add"
     print "请输入代办事项: "
-    # ...
+    add = gets.chomp
+    todos << add
+    todos.each_with_index do |todo, index|
+      puts "#{index}: #{todo}"
+    end
   elsif command == "remove"
     print "请输入要删除的编号: "
-    # ...
+      todos.delete_at(gets.chomp.to_i)
+      todos.each_with_index do |todo, index|
+        puts "#{index}: #{todo}"
+      end
   elsif command == "save"
     puts "存盘离开"
 
-    # ...
+    target = File.open("todos.txt", 'w')
+    for i in todos
+      target.write(i)
+      target.write("\n")
+    end
+    target.close()
     break;
   else
     puts "看不懂，请再输入一次"
diff --git a/todos.text b/todos.text
new file mode 100644
index 0000000..4757e85
--- /dev/null
+++ b/todos.text
@@ -0,0 +1,4 @@
+Buy book
+Go Shopping
+Walk
+Gogo
diff --git a/todos.txt b/todos.txt
index 4757e85..ed97647 100644
--- a/todos.txt
+++ b/todos.txt
@@ -1,4 +1,4 @@
 Buy book
 Go Shopping
 Walk
-Gogo
+go home

From 56e55f5d484a587d850dabf6a7665068ae6896f0 Mon Sep 17 00:00:00 2001
From: FengYue <10761101@gm.nfu.edu.tw>
Date: Thu, 13 Jan 2022 20:15:24 +0800
Subject: [PATCH 2/2] fix 02-variable.rb

---
 02-variable.rb | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/02-variable.rb b/02-variable.rb
index b8a8446..ccc790b 100644
--- a/02-variable.rb
+++ b/02-variable.rb
@@ -1,12 +1,12 @@
 # 题目: 交换 a, b 变数的值
 
-a = 2
-b = 1
+a = 1
+b = 2
 
 puts "a 是 #{a}"
 puts "b 是 #{b}"
 
-# ...
+a, b = b, a
 
 puts "a 应该是 2，现在是 #{a}"
 puts "b 应该是 1，现在是 #{b}"