MultipleChoiceCheckbox3

Multiple Choice with Checkboxes

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This PG code shows how to write a multiple choice question with possibly more than one correct answer by using checkboxes.

• Download file: File:MultipleChoiceCheckbox3.txt (change the file extension from txt to pg when you save it)
• File location in NPL: FortLewis/Authoring/Templates/Misc/MultipleChoiceCheckbox3.pg

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PG problem file	Explanation
Problem tagging data	Problem tagging:
DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", "PGchoicemacros.pl", ); TEXT(beginproblem());	Initialization:
$mc = new_checkbox_multiple_choice(); $mc -> qa ( "Select all expressions that are equivalent to \( e^{x^2 + 1/x} \). There may be more than one correct answer.", "\( e^{x^2} e^{1/x} \) $BR", "\( e^{x^2} e^{x^{-1}} \) $BR", ); $mc -> extra( "\( \displaystyle \frac{ e^{x^2} }{ e^x } \) $BR", ); $mc -> makeLast("None of the above");	Setup: Use the question and answer method qa( ) to store the question string and correct answer strings in $mc. For example, $mc->qa("question","correct answer 1","correct answer 2");. Note that unlike match lists and select lists, you cannot call the qa( ) method again. If you include math symbols you should switch to LaTeX mode \( \), and use \displaystyle with extra spacing $BR after each entry, if necessary. For example, $mc->qa( "Question text here.", "\( x^2 \) $BR", "\( \displaystyle \frac{x^2}{4-x} \) $BR" ); Incorrect answers are specified as a list of string arguments to the extra( ) method. The arguments of the makeLast( ) method will appear at the end of the list and will not be shuffled, unlike the arguments of extra( ), which are shuffled. The arguments to makeLast( ) can either be a new extra answers or only the correct answer. For example, if the only correct answer is "None of the above", use $mc->qa("question","None of the above"); $mc->extra("very wrong","distractor","red herring"); $mc->makeLast("None of the above"); To make answers appear in a certain order (e.g., Yes followed by No and Maybe), use $mc->qa("question","Yes"); $mc->makeLast("Yes","No","Maybe"); and do not use extra( ) at all.
Context()->texStrings; BEGIN_TEXT Additional instructions can be put here. $BR \{ $mc -> print_q() \} $BR \{ $mc -> print_a() \} END_TEXT Context()->normalStrings;	Main Text: Print the question and answers. Print the question text using $mc->print_q() and the list of all answers using $mc->print_a().
install_problem_grader(~~&std_problem_grader); $showPartialCorrectAnswers = 0; ANS( checkbox_cmp( $mc->correct_ans() ) );	Answer Evaluation:
Context()->texStrings; BEGIN_SOLUTION ${PAR}SOLUTION:$PAR The correct answer is \{ $mc->correct_ans() \} END_SOLUTION Context()->normalStrings; COMMENT('MathObject version.'); ENDDOCUMENT();	Solution:

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