resolve the exercises 1-10

00_hello/hello.rb

@@ -0,0 +1,7 @@
+def hello
+  "Hello!"
+end
+
+def greet(name)
+  "Hello, " + name + "!"
+end

01_temperature/temperature.rb

@@ -0,0 +1,7 @@
+def ftoc(f)
+  (f - 32.0) * 5.0/9.0
+end
+
+def ctof(c)
+  c * 9.0/5.0 + 32.0
+end

02_calculator/calculator.rb

@@ -0,0 +1,32 @@
+def add(a,b)
+  a + b
+end
+
+def subtract(a,b)
+  a - b
+end
+
+def sum(a)
+  rez = 0
+  a.each { |i| rez += i}
+  rez
+end
+
+
+def mult(a)
+  rez = 1
+  a.each { |i| rez *= i }
+  rez
+end
+
+def pow(a,b)
+  a ** b
+end
+
+def fact(a)
+  rez = 1
+  for i in 1..a do
+    rez *= i
+  end
+  rez
+end

02_calculator/calculator_spec.rb

@@ -79,21 +79,37 @@
 
 describe "#multiply" do
 
-  it "multiplies two numbers"
+  it "multiplies two numbers" do
+    mult([1,2]).should == 2
+  end
 
-  it "multiplies several numbers"
+  it "multiplies several numbers" do
+    mult([1,2,3]).should == 6
+  end
 
 end
 
 describe "#power" do
-  it "raises one number to the power of another number"
+  it "raises one number to the power of another number" do
+    pow(2,2).should == 4
+  end
 end
 
 # http://en.wikipedia.org/wiki/Factorial
 describe "#factorial" do
-  it "computes the factorial of 0"
-  it "computes the factorial of 1"
-  it "computes the factorial of 2"
-  it "computes the factorial of 5"
-  it "computes the factorial of 10"
+  it "computes the factorial of 0" do
+    fact(0).should == 1
+  end
+  it "computes the factorial of 1" do
+    fact(1).should == 1
+  end
+  it "computes the factorial of 2" do
+    fact(2).should == 2
+  end
+  it "computes the factorial of 5" do
+    fact(5).should == 120
+  end
+  it "computes the factorial of 10" do
+    fact(10).should == 3628800
+  end
 end

03_simon_says/simon_says.rb

@@ -0,0 +1,33 @@
+def echo(msg)
+  msg
+end
+
+def shout(msg)
+  echo(msg.upcase)
+end
+
+def repeat(msg,n = 2)
+  ((echo(msg) + " ") * n).chop
+end
+
+def start_of_word(word,n = 1)
+  word[0,n]
+end
+
+def first_word(word)
+  word.split(" ").first
+end
+
+def titleize(msg)
+  ltwrds = ["and","the", "over", "in","of", "a", "an", "to", "for", "with"]
+  ix = 0
+  wrds = msg.split(' ')
+  wrds.each do |w|
+      if !ltwrds.include?(w) or ix == 0
+        w.capitalize!
+      end
+      ix += 1
+      w
+    end
+  wrds.join(" ")
+end

04_pig_latin/pig_latin.rb

@@ -0,0 +1,25 @@
+def translate(text)
+  vowels = "aeiou"
+  words = text.split(" ")
+
+  words.map! do |word|
+    if vowels.include?(word[0])
+      word + "ay"
+    else
+      if word.start_with?("qu")
+        word = word[2..-1] + "qu"
+      elsif word[1..2] == "qu"
+        word = word[3..-1] + word[0..2]
+      else
+        while !vowels.include?(word[0]) do
+          word = word[1..-1] + word[0]
+        end
+      end
+      word + "ay"
+    end
+  end
+
+  result = words.join(" ")
+  puts result
+  result
+end

05_silly_blocks/silly_blocks.rb

@@ -0,0 +1,18 @@
+def reverser
+  msg = yield
+  wrds = msg.split(' ')
+  wrds.map{|w| w.reverse!}
+
+  wrds.join(' ')
+end
+
+def adder(n = 1)
+  yield + n
+end
+
+
+def repeater (n = 1)
+  for i in 1..n do
+    yield
+  end
+end

06_performance_monitor/performance_monitor.rb

@@ -0,0 +1,8 @@
+def measure(n = 1)
+  time1 = Time.now
+
+  n.times { yield }
+
+  time2 = Time.now
+  (time2 - time1).to_f / n
+end

07_hello_friend/friend.rb

@@ -0,0 +1,11 @@
+class Friend
+
+  def greeting(name = "")
+    if name == ""
+      "Hello!"
+    else
+      "Hello, #{name}!"
+    end
+
+  end
+end

08_book_titles/book.rb

@@ -0,0 +1,25 @@
+class Book
+
+  def titleize(msg)
+    ltwrds = ["and","the", "over", "in","of", "a", "an", "to", "for", "with"]
+    ix = 0
+    wrds = msg.split(' ')
+    wrds.each do |w|
+      if !ltwrds.include?(w) or ix == 0
+        w.capitalize!
+      end
+      ix += 1
+      w
+    end
+    wrds.join(" ")
+  end
+
+
+  def title=(title)
+    @title = titleize(title)
+  end
+
+  def title
+    @title
+  end
+end

09_timer/timer.rb

@@ -0,0 +1,18 @@
+class Timer
+
+  def seconds
+    @seconds ||= 0
+  end
+
+  def seconds=(seconds)
+    @seconds = seconds
+  end
+
+  def time_string
+    h = seconds / 3600
+    m = (seconds % 3600) / 60
+    s = seconds % 60
+
+    format("%02d:%02d:%02d", h, m, s)
+  end
+end

10_temperature_object/temperature.rb

@@ -0,0 +1,45 @@
+class Temperature
+  def initialize(temp = {})
+    if temp[:f]
+      @in_fahrenheit = temp[:f]
+      @in_celsius = Temperature.ftoc(temp[:f])
+    elsif temp[:c]
+      @in_fahrenheit = Temperature.ctof(temp[:c])#temp[:c] * 9.0/5.0 + 32.0
+      @in_celsius = temp[:c]
+    end
+  end
+
+  def self.ftoc(f)
+    (f - 32.0) * 5.0/9.0
+  end
+
+  def self.ctof(c)
+    c * 9.0/5.0 + 32.0
+  end
+
+  def self.from_celsius(ctmp)
+    Temperature.new(:c => ctmp)
+  end
+  def self.from_fahrenheit(ftmp)
+    Temperature.new(:f => ftmp)
+  end
+  def in_fahrenheit()
+    @in_fahrenheit ||= 0
+  end
+
+  def in_celsius()
+    @in_celsius ||= 0
+  end
+end
+
+class Celsius < Temperature
+  def initialize(c)
+    super(:c => c)
+  end
+end
+
+class Fahrenheit < Temperature
+  def initialize(f)
+    super(:f => f)
+  end
+end