编程基础练习簿——作业

19-filter.rb

@@ -1,19 +1,21 @@
 # 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)
-#   arr =  [7, 68, 42, 46, 9, 91, 77, 46, 86, 1]
+#
 # end
 
+
 arr =  [7, 68, 42, 46, 9, 91, 77, 46, 86, 1]
 a = []
 
 arr.each do |i|
   if i % 2 == 0
-    puts a.push(i).to_s
+    puts  i      # 这部分不知道怎么输出数组了？
   end
 end
 
-
 # puts arr.push(x).to_s
-#
+
 # puts filter_even(arr).to_s # 应该是 [68, 42, 46, 46, 86]

28-word-count.rb

@@ -1,5 +1,25 @@
 # 请打开 wordcount.txt，计算每个单字出现的次数
 
+
 doc = File.read("wordcount.txt")
 
+frequency1 = Hash.new(0)
+doc.each_char { |chr| frequency1[chr.downcase] +=1 }
+
+puts "Character: "
+frequency1.sort_by { |_key, value| value}.each do |key, value|
+  puts "#{key} : #{value}"
+end
+
+puts "-------"
+
+frequency2 = Hash.new(0)
+words = doc.to_s.split(" ")
+words.each { |word| frequency2[word.downcase] +=1 }
+
+puts "words: "
+frequency2.sort_by {|_key, value| value}.each do |key, value|
+  puts "#{key} : #{value}"
+end
+
 # ...