AnswerHints

Answer Hints

This PG code shows how to include two different kinds of answer hints:

• General answer hints that help students get started on a problem and are made available after a student has submitted an answer at least once (a "Show hints" checkbox appears near the "Submit Answers" button).
• Customized answer hints that appear in the answer feedback messages box after a student submits a particular answer that activates a pre-programmed hint.

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Problem Techniques Index

PG problem file	Explanation
DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", "answerHints.pl", ); TEXT(beginproblem());	Initialization: We need to include the macros file MathObjects.pl and answerHints.pl, which only works with MathObjects answer checkers (not old answer checkers).
Context("Numeric"); Context()->variables->are(t=>"Real",u=>"Real"); $f = Formula("2 t"); $answer = Formula("6 u");	Setup: We restrict the variables to t and u
Context()->texStrings; BEGIN_TEXT If \( f(t) = $f \), then \( f(3u) \) = \{ ans_rule(10) \} END_TEXT Context()->normalStrings; HINT(EV3(<<'END_HINT')); Substitute \( 3u \) wherever you see \( t \) in the formula for \( f \). END_HINT	Main Text: The problem text section of the file is as we'd expect.
$showPartialCorrectAnswers = 1; ANS($answer->cmp() ->withPostFilter(AnswerHints( Formula("6 t") => "Are you using the correct variable?", Formula("6 u") => "Good work!", )) );	Answer Evaluation: We use the AnswerHints postfilter provided by answerHints.pl. The answer hints should be provided by a particular answer, followed by a hash table association =>, followed by a string that will show up in the messages portion of the answer preview and feedback box when students submit their answers.

Problem Techniques Index

• POD documentation: answerHints.pl
• PG macro code: answerHints.pl