AnswerHints

Answer Hints

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

1. 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).
2. 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