Exercises 3.20 Fill-In, Literal String Answers

<exercises xml:id="fill-in-literal-exercises">

                      <title>Fill-In, Literal String Answers</title>

                      <introduction>

                        <p>
For a string answer, <pretext/> compares the reader's response against the answer as a literal string.  So characters that have special meaning in a regular expression, such as <c>.</c>, <c>(</c>, or <c>+</c>, are matched exactly rather than acting as wildcards or operators.  These examples exercise that behavior across a range of such characters, whether the correct answer is compared explicitly (with <c>use-answer</c> or <c>literal</c>) or left to be supplied automatically from the <c>fillin</c>.
                        </p>

                      </introduction>

                      <exercise label="fillin-literal-period">

                        <title>Fill-In, Decimal Point</title>

                        <statement>

                          <p>
Give the value of <m>\pi</m>, rounded to two decimal places. <fillin mode="string" answer="3.14"/>
                          </p>

                        </statement>

                        <evaluation> <evaluate> <test correct="yes"> <strcmp use-answer="yes"/> </test> </evaluate> </evaluation>

                      </exercise>

                      <exercise label="fillin-literal-address">

                        <title>Fill-In, A Dotted Address</title>

                        <statement>

                          <p>
Enter the IPv4 address <c>192.168.1.1</c>, including its dots. <fillin mode="string" answer="192.168.1.1"/>
                          </p>

                        </statement>

                        <evaluation> <evaluate> <test correct="yes"> <strcmp use-answer="yes"/> </test> </evaluate> </evaluation>

                      </exercise>

                      <exercise label="fillin-literal-formula">

                        <title>Fill-In, A Formula with Several Symbols</title>

                        <statement>

                          <p>
Enter the formula <c>f(x) = x^2 + 1</c> exactly, using a caret for the exponent. <fillin mode="string" answer="f(x) = x^2 + 1"/>
                          </p>

                        </statement>

                        <evaluation> <evaluate> <test correct="yes"> <strcmp use-answer="yes"/> </test> </evaluate> </evaluation>

                      </exercise>

                      <exercise label="fillin-literal-path">

                        <title>Fill-In, A File Path</title>

                        <statement>

                          <p>
Enter the Windows path <c>C:\Users</c>, with a backslash. <fillin mode="string" answer="C:\Users"/>
                          </p>

                        </statement>

                        <evaluation> <evaluate> <test correct="yes"> <strcmp use-answer="yes"/> </test> </evaluate> </evaluation>

                      </exercise>

                      <exercise label="fillin-literal-price">

                        <title>Fill-In, A Price</title>

                        <statement>

                          <p>
Write one hundred dollars with a leading dollar sign, as <c>$100</c>. <fillin mode="string" answer="$100"/>
                          </p>

                        </statement>

                        <evaluation> <evaluate> <test correct="yes"> <strcmp use-answer="yes"/> </test> </evaluate> </evaluation>

                      </exercise>

                      <exercise label="fillin-literal-case">

                        <title>Fill-In, Literal Match Ignoring Case</title>

                        <statement>

                          <p>
Enter the placeholder <c>foo(bar)</c>, in any mix of upper- and lower-case letters. <fillin mode="string" answer="foo(bar)"/>
                          </p>

                        </statement>

                        <evaluation> <evaluate> <test correct="yes"> <strcmp use-answer="yes" case="insensitive"/>

                        <feedback>

                          <p>
Case is ignored, but the parentheses are part of the answer and are matched literally.
                          </p>

                        </feedback>

                        </test> </evaluate> </evaluation>

                      </exercise>

                      <exercise label="fillin-literal-explicit">

                        <title>Fill-In, Explicit Literal Test</title>

                        <statement>

                          <p>
Enter the placeholder <c>foo(bar)</c>, including the parentheses.  Here the comparison states the pattern directly and marks it as a literal match with <c>literal="yes"</c>. <fillin mode="string" answer="foo(bar)"/>
                          </p>

                        </statement>

                        <evaluation> <evaluate> <test correct="yes"> <strcmp literal="yes">foo(bar)</strcmp> </test> </evaluate> </evaluation>

                      </exercise>

                      <exercise label="fillin-literal-synthesized">

                        <title>Fill-In, Answer Taken from the Fillin</title>

                        <statement>

                          <p>
Enter the placeholder <c>foo(bar)</c>, including the parentheses.  Here no correct test is written at all: the correct answer is taken from the <c>fillin</c> and compared literally, while the test below only supplies a hint. <fillin mode="string" answer="foo(bar)"/>
                          </p>

                        </statement>

                        <evaluation> <evaluate> <test> <strcmp>foobar</strcmp>

                        <feedback>

                          <p>
The parentheses are part of the answer.
                          </p>

                        </feedback>

                        </test> </evaluate> </evaluation>

                      </exercise>

                      </exercises>