<p>Parse and evaluate simple math word problems returning the answer as an integer.</p>
<h2>Iteration 0 — Numbers</h2>
<p>Problems with no operations simply evaluate to the number given.</p>
<blockquote>
<p>What is 5?</p>
</blockquote>
<p>Evaluates to 5.</p>
<h2>Iteration 1 — Addition</h2>
<p>Add two numbers together.</p>
<blockquote>
<p>What is 5 plus 13?</p>
</blockquote>
<p>Evaluates to 18.</p>
<p>Handle large numbers and negative numbers.</p>
<h2>Iteration 2 — Subtraction, Multiplication and Division</h2>
<p>Now, perform the other three operations.</p>
<blockquote>
<p>What is 7 minus 5?</p>
</blockquote>
<p>2</p>
<blockquote>
<p>What is 6 multiplied by 4?</p>
</blockquote>
<p>24</p>
<blockquote>
<p>What is 25 divided by 5?</p>
</blockquote>
<p>5</p>
<h2>Iteration 3 — Multiple Operations</h2>
<p>Handle a set of operations, in sequence.</p>
<p>Since these are verbal word problems, evaluate the expression from<br>
left-to-right, <em>ignoring the typical order of operations.</em></p>
<blockquote>
<p>What is 5 plus 13 plus 6?</p>
</blockquote>
<p>24</p>
<blockquote>
<p>What is 3 plus 2 multiplied by 3?</p>
</blockquote>
<p>15  (i.e. not 9)</p>
<h2>Iteration 4 — Errors</h2>
<p>The parser should reject:</p>
<ul>
<li>Unsupported operations ("What is 52 cubed?")</li>
<li>Non-math questions ("Who is the President of the United States")</li>
<li>Word problems with invalid syntax ("What is 1 plus plus 2?")</li>
</ul>
<h2>Bonus — Exponentials</h2>
<p>If you'd like, handle exponentials.</p>
<blockquote>
<p>What is 2 raised to the 5th power?</p>
</blockquote>
<p>32</p>

Wordy

Iteration 0 — Numbers

Iteration 1 — Addition

Iteration 2 — Subtraction, Multiplication and Division

Iteration 3 — Multiple Operations

Iteration 4 — Errors

Bonus — Exponentials