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<b>Answer Evaluation:</b> | <b>Answer Evaluation:</b> | ||
When <code>$answer = Formula("2*x")</code> and a student enters the string <code>NONE</code>, they will not get any error message because when the answer checker expects a formula and gets a string it is set up not to balk. However, when <code>$answer = String("none")</code> and a student enters the formula <code>2x</code>, they will get an error message. This is because the answer checker is expecting a string and gets a formula, and when this happens it | When <code>$answer = Formula("2*x")</code> and a student enters the string <code>NONE</code>, they will not get any error message because when the answer checker expects a formula and gets a string it is set up not to balk. However, when <code>$answer = String("none")</code> and a student enters the formula <code>2x</code>, they will get an error message. This is because the answer checker is expecting a string and gets a formula, and when this happens it balks. | ||
We must use <code>typeMatch=>Formula("x")</code> so that in the event the answer is a string, no error message will appear. | We must use <code>typeMatch=>Formula("x")</code> so that in the event the answer is a string, no error message will appear. | ||
</p> | </p> | ||
Revision as of 07:31, 3 December 2010
Answer is a String, or a Number, or a Function, etc.
This PG code shows how to prevent error messages from appearing when an answer may be one of several data types.
- Download file: File:StringOrOtherType1.txt (change the file extension from txt to pg when you save it)
- File location in NPL:
FortLewis/Authoring/Templates/Precalc/StringOrOtherType1.pg
| PG problem file | Explanation |
|---|---|
|
Problem tagging: |
|
DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", "AnswerFormatHelp.pl", ); TEXT(beginproblem()); |
Initialization: |
Context("Numeric");
$y = random(0,4,1);
if ($y < 4) {
$answer = String("none");
} else {
$answer = Formula("2*x");
}
|
Setup: |
Context()->texStrings;
BEGIN_TEXT
Is there a line through the points \( (0,0) \),
\( (1,2) \), and \( (2,$y) \)? If there is,
the equation for this line. If not, enter
${BITALIC}NONE${EITALIC}.
$BR
$BR
\( y = \) \{ ans_rule(20) \}
\{ AnswerFormatHelp("formulas") \}
END_TEXT
Context()->normalStrings;
|
Main Text: |
$showPartialCorrectAnswers = 1;
ANS( $answer->cmp( typeMatch=>Formula("x") ) );
|
Answer Evaluation:
When |
Context()->texStrings;
BEGIN_SOLUTION
${PAR}SOLUTION:${PAR}
Solution explanation goes here.
END_SOLUTION
Context()->normalStrings;
COMMENT('MathObject version.');
ENDDOCUMENT();
|
Solution: |