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//5.N.10 Parser
//http://git.sugarlabs.org/projects/teacher-reporting
//
//Description:
/*
Select and use appropriate operations (addition, subtraction, multiplication, and division) to solve problems, including those involving money.
*/
<?php
$fp = fopen("./4.N.10.dat", "r");
if(!$fp) die ("Cannot open the file");
//Break Each line of the file into its own array element - will have to parse each array element to obtain fields
$lines = file($fp);
$numWords = str_word_count($fp);
//Will always be a multiple of four so $NumRecords will be $numWords/4
$numRecords = $numWords / 5;
//Our Associative array Will also be in sequence 1,5,9,13.. + 4 etc
//Need to tokenize each line and choose appropriate elements ($1)
//This is just to fill the array with Variables. Next we will go through the same process for the remaining fields
// Perform the logic on them add them to additional associate arrays with various meanings
// For Example
for (i=0;i<=$numRecords;i++)
{
$tok = strtok($lines, " ");
/*
Because in the end statement we will have to loop through one of the arrays, which will be localized according
#to specific aritmetic operations (- + / *). We need to account for the fact that some students may not answer a
#question with one of these operations, and if we looped through that particular operation, we would not represent
#that student in any of the logic containted within that loop in the END{} statment. Therefore an associative array
#which absolutely, accounts for any student, contained in the .dat, the CLASS[] array.
$Class[tok[0]];
*/
while ($tok !== false)
{
$Class[tok[0]];
}
}
//in this loop we will cycle through each line of the .dat file and determine at each instance of
for (i=0;i<=$numRecords;i++)
{
$tok = strtok($lines, " ");
//this if-statement allows us to determine if a student is on his/her second attempt
if ($attempts[$question_id] == 1)
{
}
while ($tok !== false)
{
$student_id = $tok[0];
$question_id = $tok[1];
$correct_sum = $tok[2];
$submitted_sum = $tok[3];
$correct = $tok[4];
//Need to associate question_id with student
$whose_question[$question_id] = $student_id;
//Need to determine which attempt this is for this particular question
$attempts[$question_id]++;
//determine total number of submissions of a student
$num_submissions[$student_id]++; //$num_incorrect[] = (num_submissions[] - num_correct[])
//*****************************Case: Correct Submission ******************************
//How many correct submissions are there - important for determining percentages for yes/no
if ($submitted_sum == $correct_sum)
{
$num_correct[$student_id]++;
//$question_num_correct[$question_id]++; will only ever be one
//this if-statement allows us to determine if a student is on his/her second attempt
if ($attempts[$question_id] > 1)
{
//the code is looking here if and only if the parser is analyzing a question which he/she
//initially got wrong but has now gotten correct
//We can assume it was initally wrong because gcompris money cents would not have a second record of a question_id
// if it was correct initially.
//TODO - determine whether wrong means previously overpaid or previously underpaid
//determine subtraction
if ($previous_response[$question_id] == "o") // if you previously overpaid
{
$correct_subtraction[$student_id]++;
}
}
}
//*****************************CASE: OVERPAID******************************
//How many times does each student overpay - important for determining subraction understanding
if ($submitted_sum > $correct_sum)
{
$student_num_overpaid[$student_id]++;
$question_num_overpaid[$question_id]++;
//this if-statement allows us to determine if a student is on his/her second attempt
if ($attempts[$question_id] == 1)
{
if($previous_response[$question_id] == "u")
{
}
elseif($previous_response[$question_id] == "o")
{
$strikes[$student_id]++;
}
}
$previous_response[$question_id] = "o"
}
//******************************Case: Underpaid***********************************
//how many times the student underpaid
if($submitted_sum < $correct_sum)
{
$student_num_underpaid[$student_id]++;
$question_num_underpaid[$question_id]++;
//this if-statement allows us to determine if a student is on his/her second attempt
if ($attempts[$question_id] == 1)
{
if($previous_response[$question_id] == "u")
{
$strikes[$student_id]++;
}
elseif($previous_response[$question_id] == "o")
{
}
}
$previous_response[$question_id] = "u"
}
}//end while()
//*******************************************************Output****************************************************
// addition can be determined if a student gets > 70% of the questions correct on their first attempt.
// subtraction can be determined if for > 70% of the questions the student initially over-paid, they immediately follow up with a correct payment.
// If a student overpays and then increases their payment, or underpays, followed by an even lower payment it can be inferred the student does not
// understand the concepts of /ddition or subtraction with money.
// * If for > 10% of the questions the student makes this mistake. He or she gets a "no" for addition and subtraction.
//****************** Addition Yes / No ***************
foreach ($Class as $student)
{
if( $num_correct[$student] >= ( .7 * ($num_submissions))
{
$understands_addition = "yes"
}
else
{
$understands_addition = "no"
}
} //end foreach
}
fclose($fp); //close 4.n.10.dat
?>
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