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Join Date: Feb 2008
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Newbie Poster
I am trying to build a random number generator based on dice. Yes, I know there are ones out there but I am trying to do this whole programming thing for myself... I thought I had done it right but it keeps telling me "Warning: Division by zero" when I am not using any division, can anyone explain and give me some advice?
Forgive me, I am a bit new here so any other info needed I can give you
<?
srand(time());
$random = (rand()%$POST_number)+1*$POST_how+$POST_str+$POST_mod;
print("You just rolled a D6 and your roll is: $random");
?>Forgive me, I am a bit new here so any other info needed I can give you
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Join Date: Jul 2008
Location: Sweet India
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Posting Shark
I think you % symbol is giving you that error..
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Join Date: Jun 2008
Location: Delhi
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Junior Poster
Hi,
Can you please let us know, what is the value in $POST_number.
as % sign is for getting reminder.
So if $POST_number will have value 0, then it will give divide by 0 error.
Can you please let us know, what is the value in $POST_number.
as % sign is for getting reminder.
So if $POST_number will have value 0, then it will give divide by 0 error.
Vivek Rawat
Keep solving complexities.
Keep solving complexities.
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Join Date: Feb 2008
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Newbie Poster
The current value is seven...it's just a number I chose. In the end it will be a user created number ranging from 1 to 24
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Join Date: Feb 2008
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Newbie Poster
Anybody else have any thoughts? I took the percent sign out and can only get 0 for an answer
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Join Date: Nov 2007
Location: Perth, Australia
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Junior Poster
Try splitting it down into sections see what happens there, and also try replacing rand() with say 5 and see if you still get the error
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Join Date: Nov 2007
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Junior Poster in Training
the modulus operator (%) takes the left side, divides it by the right side, and returns the remainder. So, 5%3 would result in two, since 5/3 yields a remainder 2.
If you are getting a division by zero error, that means the value on the right side of the equation is 0. Debug the value of your '$POST_number' variable, your error lies there.
Consider the following for random number generation emulating dice rolls:
the above creates a min and max and uses the built-in functionality of rand to return the roll.
the above does the same as the previous, just with less code. the range function creates an array of numbers starting with the first argument, ending with the last. The above example has created an array of twenty elements , values 1-20. The shuffle function takes that array and randomizes the order of its elements. The nice thing about shuffle, is that it seeds the random number generator automatically (srand function). By printing any element of the array after shuffling (I print the first one here), you get a random number within the range.
If you are getting a division by zero error, that means the value on the right side of the equation is 0. Debug the value of your '$POST_number' variable, your error lies there.
Consider the following for random number generation emulating dice rolls:
php Syntax (Toggle Plain Text)
the above creates a min and max and uses the built-in functionality of rand to return the roll.
php Syntax (Toggle Plain Text)
the above does the same as the previous, just with less code. the range function creates an array of numbers starting with the first argument, ending with the last. The above example has created an array of twenty elements , values 1-20. The shuffle function takes that array and randomizes the order of its elements. The nice thing about shuffle, is that it seeds the random number generator automatically (srand function). By printing any element of the array after shuffling (I print the first one here), you get a random number within the range.
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