first

01-hello.rb

@@ -5,4 +5,4 @@
 
 # ...
 
-puts "(请替换成最后的答案)"
+puts "Hello,#{your_name}"

02-variable.rb

@@ -8,6 +8,8 @@
 
 # ...
 
+a = b
+c = a
+b = c
 puts "a 应该是 2，现在是 #{a}"
 puts "b 应该是 1，现在是 #{b}"
-

03-triangle.rb

@@ -8,4 +8,4 @@
 
 # .....
 
-puts "直角三角形的面积是: _________"
+puts "直角三角形的面积是:   #{a.to_f*b.to_f/2}"

04-pizzas.rb

@@ -8,5 +8,5 @@
 
 # .....
 
-puts "每人可分得几片: _________ 片"
-puts "还剩下几片: _________ 片"
+puts "每人可分得几片: #{pizzas.to_i/people.to_i} 片"
+puts "还剩下几片: #{pizzas.to_i % people.to_i} 片"

05-bmi.rb

@@ -9,9 +9,19 @@
 
 print "请输入您的身高(厘米)，然后按 Enter: "
 height = gets
-
+bmi = weight.to_f/((height.to_f/100)**2)
 # .....
 
-puts "您的 BMI 是: _________"
+puts "您的 BMI 是: #{bmi}"
+
+if bmi <18.5
+    a = "过轻"
+
+elsif bmi >= 24
+    a =  "过重"
+
+  else
+    a = "正常"
+end
 
-puts "您的 BMI 结果是: _________(过轻或正常或过重)"
+puts "您的 BMI 结果是:#{a}"

06-interger-positive.rb

@@ -5,6 +5,21 @@
 x = gets
 
 # ....
+if x.to_i> 0
+  a = "正数"
+elsif x.to_i== 0
+  a = "零"
+else
+  a = "负数"
+end
 
-puts "这个数是_____ (正数或零或负数)"
-puts "这个数是_____ (偶数或奇数)"
+
+if x.to_i % 2 == 0
+  b = "偶数"
+  else
+  b = "奇数"
+end
+
+
+puts "这个数是 #{a}"
+puts "这个数是 #{b}"

07-abcde.rb

@@ -19,4 +19,23 @@
 
 # ....
 
-puts "结果是________(A或B或C或D或E)"
+
+if x.to_i < 0
+   a = "A"
+ elsif x.to_i > 0
+   if y.to_i > 0
+     if z.to_i > 0
+       a = "B"
+     elsif z.to_i < 0
+       a = "C"
+     end
+   elsif y.to_i < 0
+     if z.to_i > 0
+       a = "D"
+     elsif z.to_i < 0
+       a = "E"
+     end
+   end
+ end
+
+ puts "结果是#{a}"

08-find-max.rb

@@ -11,4 +11,23 @@
 
 # ....
 
-puts "最大的数是 ________(x或y或z)"
+a = x.to_f
+ b = y.to_f
+ c = z.to_f
+
+ if a >= b
+   if a >= c
+     big = x
+   else
+     big = z
+   end
+ else
+   if b >= c
+     big = y
+   else
+     big = z
+   end
+ end
+
+
+ puts "最大的数是 #{big}"

09-function.rb

@@ -2,6 +2,7 @@
 
 def calculate_area(a, b)
   # ....
+   a.to_f*b.to_f/2
 end
 
 print "请输入直角三角形的高，然后按 Enter: "
@@ -12,4 +13,4 @@ def calculate_area(a, b)
 
 answer = calculate_area(a,b)
 
-puts "直角三角形的面积是: #{answer}"
+puts "直角三角形的面积是: #{answer}"

10-function.rb

@@ -1,6 +1,25 @@
 # 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)
+    a = x.to_f
+   b = y.to_f
+   c = z.to_f
+
+   if a >= b
+     if a >= c
+       big = x
+     else
+       big = z
+     end
+   else
+     if b >= c
+       big = y
+     else
+       big = z
+     end
+   end
+
+   return big
 end
 
 print "请输入一个数字x，然后按 Enter: "
@@ -16,4 +35,4 @@ def find_max(x, y, z)
 
 answer = find_max(x,y,z)
 
-puts "最大的数是 #{answer}"
+puts "最大的数是 #{answer}"

11-seven.rb

@@ -2,8 +2,8 @@
 
 i = 1
 while ( i <= 100 )
-
-  # ....
-
+   if i%7 == 0
+     puts i
+      end
   i+=1
-end
+end

12-sum-even.rb

@@ -4,10 +4,12 @@
 total = 0
 
 while ( i <= 100 )
-
+if i%2 == 0
+   total += i
+  end 
   # ....
 
   i+=1
 end
 
-puts total
+puts total

13-nn.rb

@@ -2,10 +2,21 @@
 
 print "请输入数字 N，然后按 Enter: "
 n = gets
+m = n.to_i
 
 # while ( ... )
 #   while ( ...)
 #
 #   end
 # end
 
+
+i = 0
+while (i<=m)
+   j = 0
+   while (j<=m)
+     print i,"x",j, "=",i*j,"\n"
+      j += 1
+   end
+   i += 1
+ end

14-prime.rb

@@ -2,6 +2,28 @@
 
 def is_prime(n)
 # ....
+res = [1]
+  res<<n
+
+  if n == 0 || n == 1
+    return false
+  end
+
+  for i in 2..10
+    if n == i
+      next
+    end
+
+    if n % i == 0
+      res<<i
+    end
+  end
+
+  if res.length > 2
+    return false
+  else
+    return true
+  end
 end
 
 print "请输入数字 N，然后按 Enter: "

15-guess-number.rb

@@ -9,9 +9,20 @@
   #puts "太低了，再猜一次"
   #puts "太高了，再猜一次"
 
-  if n.to_i == target
-    puts "恭喜猜中啦! "
-    break
+  if n.to_i < target
+    puts "太低了，再猜一次! "
+    print "请猜一个 n~99的数字N，然后按Enter: "
   end
 
-end
+
+  if n.to_i > target
+    puts "太高了，再猜一次"
+    print "请猜一个target~99的数字N，然后按Enter: "
+  end
+
+if n.to_i == target
+  puts "恭喜猜中啦! "
+break
+end
+
+end

16-array-sum.rb

@@ -1,11 +1,10 @@
 # 给定一阵列内含数字，输出最大值
 
 def find_max(array)
-  #....
+   max = array.sort.last
 end
 
 arr = [8, 12, 36, 53, 9, 75, 3, 71, 59, 88]
 
 max = find_max(arr)
 puts "Max is #{max}" # 应该是 88
-

17-array-stats.rb

@@ -14,7 +14,20 @@
 
 puts arr.to_s
 
-puts "总和是 _____"
-puts "平均是 _____"
-puts "最大值是 _____"
-puts "最小值是 _____"
+sum = 0
+ i = arr.length
+ arr.each do |i|
+   sum += i
+ end
+
+ ave = sum/i
+
+ max = arr.sort.last
+ min = arr.sort.first
+
+
+
+ puts "总和是 #{sum}"
+ puts "平均是 #{ave}"
+ puts "最大值是 #{max}"
+ puts "最小值是 #{min}"

18-square.rb

@@ -7,4 +7,10 @@
 
 # ...
 
-puts arr.to_s
+for i in 0..(n.to_i)-1
+   arr<< i**2
+ end
+
+
+
+ puts arr.to_s

19-filter.rb

@@ -1,9 +1,16 @@
 # 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 |i|
+     if i % 2 == 0
+       result.push(i)
+     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]
+puts filter_even(arr).to_s # 应该是 [68, 42, 46, 46, 86]

20-sorting.rb

@@ -2,10 +2,17 @@
 # Hint: 可用 arr.sort 排序，和 arr.uniq 去除重复
 
 def filter_even(arr)
-  #...
+    result = []
+     arr.each do |i|
+       if i % 2 == 0
+         result.push(i)
+       end
+     end
+
+     return  result.sort.uniq
 end
 
 arr =  [7, 68, 42, 46, 9, 91, 77, 46, 86, 1]
 
 
-puts "________" # 应该是 [42, 46, 68, 86]
+puts " filter_even(arr).to_s" # 应该是 [42, 46, 68, 86]