Divide By Zero Error In Javascript
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Divide By Zero Error Sql
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way to prevent divide by 0 in javascript that is accepting user inputs. If there is no particular way to achieve this what would be the best way to handle such a situation so as to not prevent other scripts from executing? Any insights are much appreciated. javascript divide-by-zero share|improve this question edited Oct 1 '12 at 6:39 Aziz Shaikh 11.5k73753 asked Nov 9 '11 at 21:58 dibs 37711024 Simply validate your
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input so entering 0 is impossible might be an option, validation is always a good thing :) –ChrisR Nov 9 '11 at 22:00 2 The "best way" would depend on the computations you're performing and the requirements you have. For instance, is it acceptable for a computation to always succeed but return an incorrect result when fed with invalid input? –Frédéric Hamidi Nov 9 '11 at 22:02 add a comment| 5 Answers 5 active oldest votes up vote 8 down vote accepted There is no way to do that with the normal / and /= operators. The best way to do what you want is with guards: function notZero(n) { n = +n; // Coerce to number. if (!n) { // Matches +0, -0, NaN throw new Error('Invalid dividend ' + n); } return n; } and then do division like numerator / notZero(denominator) Alternatively you can always guard the output function dividend(numerator, denominator) { var dividend = numerator / denominator; if (dividend !== dividend) { throw new Error(numerator + " / " + denominator); } return dividend; } but that loses the readability and expressiveness of /=. share|improve this answer answered Nov 9 '11 at 22:02 Mike Samuel 74.7k16138182 2 Unless you need very performant code, I would use if (n === 0 || isNaN(n)
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Handling in JavaScript By Colin Ihrig May 31, 2012 Anything that can go wrong, will go wrong. divide by zero error encountered. the statement has been terminated Murphy's law is even applicable to software development. For non-trivial programs, it's not a matter of if, but when something will go wrong. Standards non-compliance, unsupported features, and browser quirks are just a http://stackoverflow.com/questions/8072323/best-way-to-prevent-handle-divide-by-0-in-javascript few sources of potential problems facing web developers. Given all of the things that can go wrong, JavaScript has a surprisingly simple way of dealing with errors ― it just gives up and fails silently. At least, that's the behavior seen by the user. In reality, there is a lot going on under the hood. When a JavaScript statement generates https://www.sitepoint.com/exceptional-exception-handling-in-javascript/ an error, it is said to throw an exception. Instead of proceeding to the next statement, the JavaScript interpreter checks for exception handling code. If there is no exception handler, then the program returns from whatever function threw the exception. This is repeated for each function on the call stack until an exception handler is found or until the top level function is reached, causing the program to terminate. Error Objects When an exception occurs, an object representing the error is created and thrown. The JavaScript language defines seven types of built-in error objects. These error types are the foundation for exception handling. Each of the error types is described in detail below. Error The "Error" type is used to represent generic exceptions. This type of exception is most often used for implementing user defined exceptions. The topic of creating user defined exceptions will be revisited later in this article. "Error" objects are instantiated by calling their constructor as shown in the following example. var error = new Error("error message"); "Error" objects contain two properties, "name" and "message". The "name" property speci
to divide by zero. While other languages will crash the program if there is an attempt made to divide by zero, JavaScript http://javascriptexample.net/error07.php does not.If you divide any number except zero itself by zero in http://www.codingforums.com/php/2404-how-do-i-avoid-division-zero-error.html JavaScript the result will be a special numerical value in JavaScript called Infinity. The only division by zero that doesn't produce that value is if you attempt to divide zero by zero which returns a different value - NaN. JavaScript provides functions so that we divide by can easily test for if either of these two values are returned.What this means is that while other languages need to test for zero before performing the division in order to avoid having the code crash, we can test afterwards in JavaScript in situations where it would make the code more complicated if we were to test before divide by zero - particularly in complex calculations where the value is almost certainly not going to be zero.Of course there may be cases where you don't want the processing to continue if an attempt is made to divide by zero. In this example we will get JavaScript to behave the same way that other browsers do when presented with an attempt to divide by zero and will produce an appropriate error message. JavaScript answer = numer / denom; if (!isFinite(answer)) throw new RangeError('Divide by zero error'); PREVIOUSCATEGORYjsBin This site is © copyright Stephen Chapman - Felgall Pty Ltd 2011-2016. Privacy Policy | Terms and Conditions You are welcome to use any the example JavaScript from this site in the scripts for your site or any that you develop for others but may not use the longer example scripts that contain a copyright notice in any other way without permission. Home Examples The Basics Objects Functions Events BOM DOM Basic DOM DOM Tables DOM Forms Server Interaction RegExp Cookies Error Handling Using
New? Today's Posts FAQ Rules Guidelines Search Advanced Search Forum :: Server side development PHP How do I avoid division by zero error? If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. Enjoy an ad free experience by logging in. Not a member yet? Register. Results 1 to 9 of 9 Thread: How do I avoid division by zero error? Thread Tools Show Printable Version Email this Page… Subscribe to this Thread… Rate This Thread Current Rating Excellent Good Average Bad Terrible 07-20-2002,10:47 PM #1 mouse View Profile View Forum Posts Visit Homepage Regular Coder Join Date Jun 2002 Location North East England Posts 853 Thanks 0 Thanked 0 Times in 0 Posts How do I avoid division by zero error? Warning: Division by zero in... I'm trying to calculate a percentage using... $percent1 = round(($num_rows1*100)/$num_rows_total); $percent2 = round(($num_rows2*100)/$num_rows_total); and so on... what's causing this error and what can I do to prevent it? [+] Computer/PC issues [+] Silverpaw3D ------------------------------------------------ Never buy a dwarf with learning disabilities... ...it's not big, and it's not clever. Reply With Quote 07-20-2002,10:56 PM #2 Spookster View Profile View Forum Posts Supreme Overlord Join Date May 2002 Location Marion, IA USA Posts 6,298 Thanks 4 Thanked 84 Times in 83 Posts Well that's easy.....stop dividing by zero. Ok well if your num_rows_total variable is equal to zero then obviously you will get this error. Are these rows referring to records in a database? You could put a conditional statement in there: if($num_rows_total!=0) $percent1 = round(($num_rows1*100)/$num_rows_total); $percent2 = round(($num_rows2*100)/$num_rows_total); } else{ //do something else if it is zero } Sp