programming-exercise

01-hello.rb

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

02-variable.rb

@@ -6,8 +6,11 @@
 puts "a 是 #{a}"
 puts "b 是 #{b}"
 
-# ...
+c = a
+
+a = b
+
+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

@@ -6,6 +6,9 @@
 print "请输入直角三角形的底边，然后按 Enter: "
 b = gets
 
+c = a.to_f * b.to_f
+
+c = c / 2
 # .....
 
-puts "直角三角形的面积是: _________"
+puts "直角三角形的面积是: __#{c}___"

04-pizzas.rb

@@ -8,5 +8,9 @@
 
 # .....
 
-puts "每人可分得几片: _________ 片"
-puts "还剩下几片: _________ 片"
+a=pizzas.to_i/people.to_i
+
+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"

05-bmi.rb

@@ -10,8 +10,20 @@
 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
+b = w/h
+b = b/h
+
+if b < 18.5
+	a = "过轻"
+elsif b >= 24
+	a = "过重"
+else
+	a = "正常"
+end
 # .....
 
-puts "您的 BMI 是: _________"
+puts "您的 BMI 是: ____#{b}_____"
 
-puts "您的 BMI 结果是: _________(过轻或正常或过重)"
+puts "您的 BMI 结果是: ____#{a}_____(过轻或正常或过重)"

06-interger-positive.rb

@@ -3,8 +3,21 @@
 
 print "请输入一个整数，然后按 Enter: "
 x = gets
-
 # ....
+x = x.to_i
+if x > 0
+	a = "正数"
+elsif x < 0
+	a = "负数"
+else
+	a = "0"
+end
+
+if x%2 != 0
+	b = "奇数"
+else
+	b = "偶数"
+end
 
-puts "这个数是_____ (正数或零或负数)"
-puts "这个数是_____ (偶数或奇数)"
+puts "这个数是__#{a}___ (正数或零或负数)"
+puts "这个数是___#{b}__ (偶数或奇数)"

07-abcde.rb

@@ -17,6 +17,27 @@
 print "请输入一个整数z，然后按 Enter: "
 z = gets
 
+x = x.to_i
+y = y.to_i
+z = z.to_i
+
+if x < 0
+	a = "A"
+else
+	if y > 0
+		if z > 0
+			a = "B"
+		else
+			a = "C"
+		end
+	else
+		if z > 0
+			a = "D"
+		else
+			a = "E"
+		end
+	end
+end
 # ....
 
-puts "结果是________(A或B或C或D或E)"
+puts "结果是____#{a}____(A或B或C或D或E)"

08-find-max.rb

@@ -9,6 +9,18 @@
 print "请输入一个数字z，然后按 Enter: "
 z = gets
 
+x = x.to_f
+y = y.to_f
+z = z.to_f
+
+if x >= y && x >= z
+	a = "x"
+elsif y >= x && y >= z
+	a = "y"
+else
+	a = "z"
+end
+
 # ....
 
-puts "最大的数是 ________(x或y或z)"
+puts "最大的数是 ___#{a}_____(x或y或z)"

09-function.rb

@@ -2,6 +2,7 @@
 
 def calculate_area(a, b)
   # ....
+	c =(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 +1,17 @@
 # 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)
+	x=x.to_f
+	y=y.to_f
+	z=z.to_f
+
+	if x>y && y>z
+		x
+	elsif y>z
+		y
+	else
+		z
+	end
 end
 
 print "请输入一个数字x，然后按 Enter: "
@@ -16,4 +27,4 @@ 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

@@ -3,7 +3,11 @@
 i = 1
 while ( i <= 100 )
 
-  # ....
+  if i%7 == 0
+
+    puts i
+
+  end
 
   i+=1
-end
+end

12-sum-even.rb

@@ -5,9 +5,13 @@
 
 while ( i <= 100 )
 
-  # ....
+  if i%2 == 0
+
+    total = total + i
+
+  end
 
   i+=1
 end
 
-puts total
+puts total

13-nn.rb

@@ -3,9 +3,17 @@
 print "请输入数字 N，然后按 Enter: "
 n = gets
 
-# while ( ... )
-#   while ( ...)
-#
-#   end
-# end
+n = n.to_i
 
+a=1
+b=1
+
+while (a<=n)
+   	while (b<=n)
+			print "#{a*b}  "
+			b=b+1
+   	end
+		b=1
+		a=a+1
+		puts
+end

14-prime.rb

@@ -1,6 +1,16 @@
 # 输入一个数字 N，请检查是不是质数
 
 def is_prime(n)
+  n=n.to_i
+  i=2
+  while i<=n/2
+    if n % i ==0
+      return false
+    else
+      i = i + 1
+    end
+  end
+  true
 # ....
 end
 

15-guess-number.rb

@@ -5,13 +5,16 @@
 while (true)
   print "请猜一个 0~99 的数字 N，然后按 Enter: "
   n = gets
-
-  #puts "太低了，再猜一次"
-  #puts "太高了，再猜一次"
-
+  n=n.to_i
+  if n<target
+    puts "太低了，再猜一次"
+  end
+  if n>target
+    puts "太高了，再猜一次"
+  end
   if n.to_i == target
     puts "恭喜猜中啦! "
     break
   end
 
-end
+end

16-array-sum.rb

@@ -2,10 +2,18 @@
 
 def find_max(array)
   #....
+	i=0
+	m=0
+	while i <(array.length)
+		if m<array[i]
+			m=array[i]
+		end
+		i=i+1
+	end
+	m
 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

@@ -11,10 +11,15 @@
     arr << user_input.to_i
   end
 end
+total = 0
+arr.each{|a| total += a}
+ave = total.to_f/arr.length
+max = arr.max
+min = arr.min
 
 puts arr.to_s
 
-puts "总和是 _____"
-puts "平均是 _____"
-puts "最大值是 _____"
-puts "最小值是 _____"
+puts "总和是 __#{total}___"
+puts "平均是 ___#{ave}__"
+puts "最大值是 ___#{max}__"
+puts "最小值是 ___#{min}__"

18-square.rb

@@ -4,7 +4,12 @@
 
 print "请输入数字 N，然后按 Enter: "
 n = gets
-
+n=n.to_i
+i = 0
+while i<=n
+	arr[i]=i ** 2
+	i=i+1
+end
 # ...
 
-puts arr.to_s
+puts arr.to_s

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)
-  #...
+	newarr = []
+	for a in arr
+		if a%2==0
+			newarr.push(a)
+		end
+	end
+	newarr
 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

@@ -3,9 +3,17 @@
 
 def filter_even(arr)
   #...
+	newarr = []
+	for a in arr
+		if a%2==0
+			newarr.push(a)
+		end
+	end
+	newarr.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)}" # 应该是 [42, 46, 68, 86]