PreTeXt Sample Book Abstract Algebra (SAMPLE ONLY)

  <exercises xml:id="fill-in-exercises-old">
    <title>Fill-In Exercises (Old Style)</title>
    <introduction>
      <p>
        This section has <term>fill-in-the-blank</term>
        (<init>FITB</init>) exercises that use an old syntax.
        They were designed for projects transitioning from Runestone's ReST syntax to <pretext/>.
        So they are really only here for testing,
        and not for any sort of documentation.
        They will not receive support or enhancements.
        <foreign>Caveat emptor</foreign>.
      </p>
    </introduction>
    <exercise label="fillin-integer">
      <title>Fill-In, Integer Answer</title>
      <statement>
        <p>
          The game of bowling uses <var width="28"/> pins that you try to knock down.
          (This answer blank has been set to be very wide.)
        </p>
      </statement>
      <setup>
        <var>
        <condition number="10">
        <feedback>
          <p>
            Arranged in a triangle, there are <m>1+2+3+4 = 10</m> pins,
            a so-called <term>triangular</term> number.
          </p>
        </feedback>
        </condition>
        <condition number="16">
        <feedback>
          <p>
            <em>Close</em>!
            You may have used hexadecimal notation,
            when you did not really mean to.
          </p>
        </feedback>
        </condition>
        <condition string=".*">
        <feedback>
          <p>
            Incorrect.
          </p>
        </feedback>
        </condition>
        </var>
      </setup>
    </exercise>
    <exercise label="fillin-string-integer">
      <title>Fill-In, String and Number Answers</title>
      <statement>
        <p>
          Complete the following line of a Python program so that it will declare an integer variable <c>age</c> with an initial value of <c>5</c>. (These two answer blanks have been set to be very short.)
        </p>
        <p>
          <var width="2"/> <c>age = </c> <var width="3"/><c>;</c>
        </p>
      </statement>
      <setup>
        <var>
        <condition string="int">
        <feedback>
          <p>
            A variable of type <c>int</c> is appropriate for whole number ages.
          </p>
        </feedback>
        </condition>
        <condition string=".*">
        <feedback>
          <p>
            Remember that Java uses just the first three letters of the word
            <q>integer</q>
            to define an integral type.
          </p>
        </feedback>
        </condition>
        </var>
        <var>
        <condition number="5">
        <feedback>
          <p>
            An integer variable may be initialized to a value.
          </p>
        </feedback>
        </condition>
        <condition string=".*">
        <feedback>
          <p>
            Use <c>5</c> as the initial value of the variable.
          </p>
        </feedback>
        </condition>
        </var>
      </setup>
    </exercise>
    <exercise label="fillin-case-insensitive">
      <title>Fill-In, Case-Insensitive Answer</title>
      <statement>
        <p>
          The word <var/> is the opposite of
          <q>yes</q>. (Try a mixture of upper and lower-case letters.)
        </p>
      </statement>
      <setup>
        <var case="insensitive">
<!-- Note, no "p" in "feedback" -->
        <condition string="no">
        <feedback>
          The correct answers are  no, No, nO, and NO.
        </feedback>
        </condition>
        <condition string=".*">
        <feedback>
          Incorrect.
        </feedback>
        </condition>
        </var>
      </setup>
    </exercise>
    <exercise label="fillin-decimal">
      <title>Fill-In, Decimal Answer</title>
      <statement>
        <p>
          The decimal number <var/> is an approximation of
          <m>\sfrac{1}{3}</m> to within three significant figures. (
          <url href="https://en.wikipedia.org/wiki/Significant_figures" visual="en.wikipedia.org/wiki/Significant_figures">Wikipedia</url>).
        </p>
      </statement>
      <setup>
        <var>
<!-- Note, no "p" in "feedback" -->
        <condition number="0.333" tolerance="0.0005">
        <feedback>
          <p>
            Any value in the interval <m>0.333\pm 0.0005</m> is correct.
          </p>
        </feedback>
        </condition>
        <condition string=".*">
        <feedback>
          <p>
            Incorrect.
            Did you provide three <em>significant figures</em>?
          </p>
        </feedback>
        </condition>
        </var>
      </setup>
    </exercise>
  </exercises>