PHP Aritmetic Operators
<?php
$a == \"1\";
$a + $a == \"$total\";
print (\"$total\");
?>I'm just wondering why the above code wont work? I'm sure there is some thing I'm missing here..
<?php
$a == \"1\";
$a + $a == \"$total\";
print (\"$total\");
?>I'm just wondering why the above code wont work? I'm sure there is some thing I'm missing here..
Mark Hensler posted this at 08:02 — 20th November 2002.
He has: 4,048 posts
Joined: Aug 2000
$a == "1";
== is a comparison opperator, not an assignment opperator
$a + $a == "$total";
Even if we assume this was corrected to:
$a + $a = "$total";
This still would not work because $a + $a is an expression and cannot be assigned a value.
Mark Hensler
If there is no answer on Google, then there is no question.
nuk3 posted this at 08:17 — 20th November 2002.
They have: 238 posts
Joined: May 2002
I'm creating a quiz script and I need to add up all the values that were correct. I'm wondering how I would go about this.
Here is the code, I know its bulky but I'm still learning..
<?php
$right = \"You got it right!\";
$wrong = \"You got it wrong!\";
$question = array ( \"This Quiz is made by who?\", \"Question2\", \"Question3\", \"Question4\", \"Question5\", \"Question6\", \"Question7\", \"Question8\", \"Question9\", \"Question10\" );
$answer = array ( \"Owen\", \"Blah2\", \"Blah3\", \"Blah4\", \"Blah5\", \"Blah6\", \"Blah7\", \"Blah8\", \"Blah9\", \"Blah10\" );
print (\"Question 1 :\");
print (\"Question: $question[0]\");
print (\"Your Answer: $q1\");
print (\"Correct Answer: $answer[0]\");
print (\"Result: \");
if ($answer[0] == \"$q1\") {
print (\"$right\"); } else {
print (\"$wrong\");}
print (\"</font>\");
?>
The $q1 variable is delivered from the option that the user selects on the previous page. I so far only have 1 question implemented. For an online demo go HERE.
Mark Hensler posted this at 08:27 — 20th November 2002.
He has: 4,048 posts
Joined: Aug 2000
try this:
<?php
$cnt_right = 0;
$cnt_wrong = 0;
$question = array ( \"This Quiz is made by who?\", \"Question2\", \"Question3\", \"Question4\", \"Question5\" );
$answer = array ( \"Owen\", \"Blah2\", \"Blah3\", \"Blah4\", \"Blah5\" );
$i=0;
while (isset($question[$i]) && isset($answer[$i])) {
print (\"Question \".($i+1).\": $question[$i]\n\");
print (\"Your Answer: \".${'q'.$i}.\"\n\");
print (\"Correct Answer: $answer[$i]\n\");
print (\"Result: \");
if ($answer[$i] == ${'q'.$i}) {
print (\"You got it right!\");
$cnt_right++;
}
else {
print (\"You got it wrong!\");
$cnt_wrong++;
}
$i++;
}
print (\"Final Results:\n\");
print (\"Total Correct: $cnt_right\n\");
print (\"Total Wrong: $cnt_wrong\n\");
?>
Mark Hensler
If there is no answer on Google, then there is no question.
nuk3 posted this at 08:30 — 20th November 2002.
They have: 238 posts
Joined: May 2002
I dont understand a thing above lol
Mark Hensler posted this at 08:39 — 20th November 2002.
He has: 4,048 posts
Joined: Aug 2000
a few comments inset...
<?php
// counters
$cnt_right = 0;
$cnt_wrong = 0;
// array of questions and correct answers
$question = array ( \"This Quiz is made by who?\", \"Question2\", \"Question3\", \"Question4\", \"Question5\" );
$answer = array ( \"Owen\", \"Blah2\", \"Blah3\", \"Blah4\", \"Blah5\" );
// init counter to zero
$i=0;
// loop while there is a question and answer
while (isset($question[$i]) && isset($answer[$i])) {
// \"Question 1: This Quiz is made by who?\"
// \"Your Answer: John Doe\"
// \"Correct Answer: Owen\"
print (\"Question \".($i+1).\": $question[$i]\n\");
print (\"Your Answer: \".${'q'.($i+1)}.\"\n\");
print (\"Correct Answer: $answer[$i]\n\");
print (\"Result: \");
// IF the answer for the current question EQUALS the answer provided in the
// form THEN
//
// to be even more detailed....
// ${'q'.($i+1)} is a dynamic variable
// when on quesion 1, the valiable being accessed will be $q1
// when on question 2, it will be $q2
// etc., etc., so on, and so forth
// when on question 5, it will be $q5
if ($answer[$i] == ${'q'.($i+1)}) {
print (\"You got it right!\");
// increment counter for correct answers
$cnt_right++;
}
else {
print (\"You got it wrong!\");
// increment counter for wrong answers
$cnt_wrong++;
}
$i++;
} // loop
print (\"Final Results:\n\");
print (\"Total Correct: $cnt_right\n\");
print (\"Total Wrong: $cnt_wrong\n\");
?>
Mark Hensler
If there is no answer on Google, then there is no question.
nuk3 posted this at 08:45 — 20th November 2002.
They have: 238 posts
Joined: May 2002
Ok I think I understand it now. There are just a few new things that you are using above which I've never seen before.. Thanks allot for your help Mark
Suzanne posted this at 14:34 — 20th November 2002.
She has: 5,507 posts
Joined: Feb 2000
Mark, you'd be an excellent teacher. Scratch that, you ARE an excellent teacher.
nuk3 posted this at 00:39 — 23rd November 2002.
They have: 238 posts
Joined: May 2002
Yes he is a good teacher!
TonyMontana posted this at 06:41 — 24th November 2002.
They have: 218 posts
Joined: Apr 2001
$a + $a = "$total";
$total first needs to be defined, 'given a value', and since it needs to be evaluated, omit the quotation marks, ie:
<?php
$a = 6;
$total = $a + $a;
echo $total;
?>
Cheers,
TonyMontana
nuk3 posted this at 04:48 — 25th November 2002.
They have: 238 posts
Joined: May 2002
Ok thanks for that..
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