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MDL-36025 qtype calculated: Fix handling of "-0"

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This commit is contained in:
Matt Petro 2012-10-19 10:59:42 -04:00
parent d402e05ba7
commit 2cae75aacc
1 changed files with 7 additions and 1 deletions
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8
question/type/calculated/questiontype.php
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@ -1227,7 +1227,7 @@ class qtype_calculated extends question_type {
echo $OUTPUT->notification(get_string('notvalidnumber', 'qtype_calculated', $a));
$val = 1.0;
}
if ($val < 0) {
if ($val <= 0) { // MDL-36025 Use parentheses for "-0"
$str = str_replace('{'.$name.'}', '('.$val.')', $str);
} else {
$str = str_replace('{'.$name.'}', $val, $str);
@ -1255,6 +1255,7 @@ class qtype_calculated extends question_type {
} else if ($formula === '*') {
$str = '*';
} else {
$str = null;
eval('$str = '.$formula.';');
}
return $str;
@ -1870,6 +1871,11 @@ function qtype_calculated_calculate_answer($formula, $individualdata,
// Exchange formula variables with the correct values...
$answer = question_bank::get_qtype('calculated')->substitute_variables_and_eval(
$formula, $individualdata);
if (!is_numeric($answer)) {
// Something went wrong, so just return NaN.
$calculated->answer = NAN;
return $calculated;
}
if ('1' == $answerformat) { /* Answer is to have $answerlength decimals */
/*** Adjust to the correct number of decimals ***/
if (stripos($answer, 'e')>0) {