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Adding 3rd exercise
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‎02_calculator/calculator_spec.rb

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# # Topics
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#
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# * functions
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# * math
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# * arrays
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# * iterating/looping
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#
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# # Calculator
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#
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# you will build a simple calculator script with the following methods:
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#
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# `add` takes two parameters and adds them
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#
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# `subtract` takes two parameters and subtracts the second from the first
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#
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# `sum` takes an *array* of parameters and adds them all together
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#
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# # Warning
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#
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# You may not have enough knowledge yet to complete `sum`. You will probably
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# need to use **loops** (e.g. `while`) or **iterators** (e.g. `each`) to
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# get the tests to pass.
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#
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# # Bonus
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#
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# There are also some bonus exercises for when you finish the regular ones. The bonus round will help teach you test-driven *development*, not simply test-guided *learning*.
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#
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# Your mission, should you choose to accept it, is to write *tests* for three new methods:
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#
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# * `multiply` which multiplies two numbers together
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# * `power` which raises one number to the power of another number
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# * `[factorial](http://en.wikipedia.org/wiki/Factorial)` (check Wikipedia if you forgot your high school math).
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#
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#
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require "calculator"
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describe "add" do
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it "adds 0 and 0" do
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add(0,0).should == 0
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end
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it "adds 2 and 2" do
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add(2,2).should == 4
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end
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it "adds positive numbers" do
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add(2,6).should == 8
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end
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end
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describe "subtract" do
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it "subtracts numbers" do
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subtract(10,4).should == 6
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end
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end
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describe "sum" do
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it "computes the sum of an empty array" do
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sum([]).should == 0
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end
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it "computes the sum of an array of one number" do
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sum([7]).should == 7
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end
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it "computes the sum of an array of two numbers" do
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sum([7,11]).should == 18
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end
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it "computes the sum of an array of many numbers" do
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sum([1,3,5,7,9]).should == 25
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end
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end
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# Extra Credit Test-Driving Bonus:
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# once the above tests pass,
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# write tests and code for the following:
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describe "#multiply" do
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it "multiplies two numbers"
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it "multiplies several numbers"
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end
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describe "#power" do
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it "raises one number to the power of another number"
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end
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# http://en.wikipedia.org/wiki/Factorial
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describe "#factorial" do
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it "computes the factorial of 0"
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it "computes the factorial of 1"
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it "computes the factorial of 2"
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it "computes the factorial of 5"
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it "computes the factorial of 10"
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end

‎02_calculator/index.html

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<html>
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<head>
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<title>Test-First Teaching: learn_ruby: calculator</title>
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<link href="../assets/style.css" media="screen" rel="stylesheet" type="text/css" />
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</head>
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<body>
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<div class="header">
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<h1><a href="http://testfirst.org">TestFirst.org</a></h1>
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<h2>the home of test-first teaching</h2>
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</div>
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<div class="nav">
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<h2><a href="../index.html">learn_ruby</a></h2>
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<b>Labs:</b>
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<ul>
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<li><a href="../00_hello/index.html">00 Hello</a></li>
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<li><a href="../01_temperature/index.html">01 Temperature</a></li>
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<li>02 Calculator</li>
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<li><a href="../03_simon_says/index.html">03 Simon Says</a></li>
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<li><a href="../04_pig_latin/index.html">04 Pig Latin</a></li>
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<li><a href="../05_silly_blocks/index.html">05 Silly Blocks</a></li>
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<li><a href="../06_performance_monitor/index.html">06 Performance Monitor</a></li>
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<li><a href="../07_hello_friend/index.html">07 Hello Friend</a></li>
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<li><a href="../08_book_titles/index.html">08 Book Titles</a></li>
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<li><a href="../09_timer/index.html">09 Timer</a></li>
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<li><a href="../10_temperature_object/index.html">10 Temperature Object</a></li>
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<li><a href="../11_dictionary/index.html">11 Dictionary</a></li>
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<li><a href="../12_rpn_calculator/index.html">12 Rpn Calculator</a></li>
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<li><a href="../13_xml_document/index.html">13 Xml Document</a></li>
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<li><a href="../14_array_extensions/index.html">14 Array Extensions</a></li>
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<li><a href="../15_in_words/index.html">15 In Words</a></li>
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</ul>
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</div>
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<h1>calculator</h1>
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<div class="content"><div class="rspec_file"> <div class="intro"><h1>Topics</h1>
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<ul>
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<li>functions</li>
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<li>math</li>
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<li>arrays</li>
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<li>iterating/looping</li>
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</ul>
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<h1>Calculator</h1>
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<p>you will build a simple calculator script with the following methods:</p>
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<p><code>add</code> takes two parameters and adds them</p>
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<p><code>subtract</code> takes two parameters and subtracts the second from the first</p>
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<p><code>sum</code> takes an <em>array</em> of parameters and adds them all together</p>
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<h1>Warning</h1>
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<p>You may not have enough knowledge yet to complete <code>sum</code>. You will probably
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need to use <strong>loops</strong> (e.g. <code>while</code>) or <strong>iterators</strong> (e.g. <code>each</code>) to
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get the tests to pass.</p>
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<h1>Bonus</h1>
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<p>There are also some bonus exercises for when you finish the regular ones. The bonus round will help teach you test-driven <em>development</em>, not simply test-guided <em>learning</em>.</p>
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<p>Your mission, should you choose to accept it, is to write <em>tests</em> for three new methods:</p>
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<ul>
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<li><code>multiply</code> which multiplies two numbers together</li>
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<li><code>power</code> which raises one number to the power of another number</li>
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<li><code>[factorial](http://en.wikipedia.org/wiki/Factorial)</code> (check Wikipedia if you forgot your high school math).</li>
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</ul>
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</div>
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<div class="tests">
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<h1>Tests</h1>
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<a class="raw_file" href="calculator_spec.rb">calculator_spec.rb</a>
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<pre>
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require &quot;calculator&quot;
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describe &quot;add&quot; do
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it &quot;adds 0 and 0&quot; do
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add(0,0).should == 0
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end
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it &quot;adds 2 and 2&quot; do
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add(2,2).should == 4
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end
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it &quot;adds positive numbers&quot; do
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add(2,6).should == 8
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end
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end
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describe &quot;subtract&quot; do
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it &quot;subtracts numbers&quot; do
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subtract(10,4).should == 6
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end
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end
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describe &quot;sum&quot; do
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it &quot;computes the sum of an empty array&quot; do
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sum([]).should == 0
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end
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it &quot;computes the sum of an array of one number&quot; do
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sum([7]).should == 7
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end
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it &quot;computes the sum of an array of two numbers&quot; do
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sum([7,11]).should == 18
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end
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it &quot;computes the sum of an array of many numbers&quot; do
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sum([1,3,5,7,9]).should == 25
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end
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end
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# Extra Credit Test-Driving Bonus:
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# once the above tests pass,
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# write tests and code for the following:
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describe &quot;#multiply&quot; do
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it &quot;multiplies two numbers&quot;
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it &quot;multiplies several numbers&quot;
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end
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describe &quot;#power&quot; do
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it &quot;raises one number to the power of another number&quot;
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end
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# http://en.wikipedia.org/wiki/Factorial
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describe &quot;#factorial&quot; do
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it &quot;computes the factorial of 0&quot;
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it &quot;computes the factorial of 1&quot;
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it &quot;computes the factorial of 2&quot;
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it &quot;computes the factorial of 5&quot;
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it &quot;computes the factorial of 10&quot;
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end</pre>
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</div>
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</div>
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</div>
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<div class="footer"><a href="http://testfirst.org">TestFirst.org</a></div>
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</body>
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</html>

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