Logical Error In Java
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Run Time Errors
in Java programming can be extremely difficult to find because they don't reflect any sort of coding problem or an error in the use of Java language elements. The code runs perfectly as written -- it just isn't performing the task that you expected it to perform. As a result, logical errors can be the hardest errors to syntax error definition find. You need to spend time going through your code looking for a precise reason for the error. Here's a list of common logical errors that Java developers encounter: Using incorrect operator precedence: The order in which Java interprets operators is important. Applications often produce the wrong result because the developer didn't include parentheses in the correct places. For example, the following example produces outputs of 11, 13, 9, and 8 from the four variables, all due to the location (or lack) of the parentheses. public class OperatorError { public static void main(String[] args) { // Create some variables. int MyVar1 = 5 + 4 * 3 / 2; int MyVar2 = (5 + 4) * 3 / 2; int MyVar3 = (5 + 4) * (3 / 2); int MyVar4 = (5 + (4 * 3)) / 2; // Output the result. System.out.println( "MyVar1: " + MyVar1 + "nMyVar2: " + MyVar2 + "nMyVar3: " + MyVar3 + "nMyVar4: " + MyVar4); } } Defining the wrong count: Possibly the most commo
errors are caught by the complier and therefore the complier can show you where (sometimes exactly where, sometimes approximately where) the error occurs. Guidelines for Correcting Logic Errors (Run-time Errors) Avoid the debugging process. 3 types of errors in programming Taking the time to write a correct and well-documented program from the start
Runtime Error Definition
of the programming process will save you time in the long run. Finding and correcting program "bugs" (logic errors) takes a
Logic Error C++
lot of time, and it can be frustrating, especially if you neglected to include code comments Debug on a small scale. Thoroughly test each component of an application (each method of each object) piece by http://www.dummies.com/programming/java/logical-errors-in-java/ piece, correcting errors as you go. This is much easier than finding errors in a large program. Understand the symptom. Before changing a program, understand why the error occurred and where in the program it may have occurred. Look at what the program tried to do and where it went wrong. Use problem solving techniques to try to determine why an error happened how it could have arisen. Form several http://northern.lkdsb.net/Kedwell/ICS4U/Java/intro/Logic%20Errors.htm hypotheses about how the error might have arisen and explore these possibilities. Find the source of the error (find the root cause). Don't waste time making "random" changes to your program. After brainstorming about the cause of the error, you can start searching back through the execution of your program to see where things went wrong. A debugger can help. Examine the call stack and the values of parameters and local variables. See if it matches your expectation of what the program "should" do. Trace through an execution of your program by hand and with a debugger, stopping at certain points in the execution and/or printing out values along the way. Correct the errors and test your program thoroughly using various test cases. The Most Common Logic Errors in Java: Using a variable before it is given a valueThis is a common error found in both object-oriented and procedural languages. In Java, primitive variables must be initialized to zero or some default value so there will be no doubt as to what is stored in that variable. For Example, the following code ... int x; x = x + 1; System.out.println("X = " + x); ... would have unpredictable results (the value of x is some rand
Programming Notes # 155 Preface General Viewing tip Supplementary material Discussion Syntax errors Runtime errors Logic errors Summary http://www.dickbaldwin.com/alice/Alice0155.htm What's next? Lab project Resources Copyright About the author Preface This tutorial lesson is part of a series designed to teach you how to program using the Alice programming environment https://www.quora.com/How-do-you-go-about-finding-logical-errors-in-your-code under the assumption that you have no prior programming knowledge or experience. Have some fun Because Alice is an interactive graphic 3D programming environment, it is not only useful syntax error for learning how to program, Alice makes learning to program fun. Therefore, you should be sure to explore the many possibilities for being creative provided by Alice while you are learning to program using these tutorials. And above all, have fun in the process of learning. General In the previous lesson titled "Class-Level Methods and Inheritance" I taught logical error in you how to: Write and use class-level methods. Extend an existing class into a new class that represents a more specialized type of object than the objects created from the original class. Create objects from the new class and add them to your world. Add your new class to the gallery. Create new folders in the gallery to serve as repositories for your new classes. In this lesson, I will teach you about syntax errors, runtime errors, and logic errors, as well as some of the ways to avoid them. Viewing tip I recommend that you open another copy of this document in a separate browser window and use the following links to easily find and view the figures while you are reading about them. Figure 1. Result of dividing by zero. Figure 2. Error message from dividing by zero. Supplementary material Once you have mastered Alice, I recommend that you also study the other lessons in my extensive collection of online programming tutorials. You will find a consolidated index at www.DickBaldwin.com. Discussion
Learning to Program Programming Languages Computer ProgrammingHow do you go about finding logical errors in your code?UpdateCancelAnswer Wiki5 Answers Kausic Gunasekkar, if (geek &&footballer ) search answer=kausic;Written 100w agoThe best way to go about that (in my opinion obviously) would be to implement the program in multiple programs. Break down your program into multiple smaller programs and write code to give it all kinds of input. Monitor the program. Make sure the code outputs both the input as well as the output so that you know where the anamoly is occuring. An alternate method would be to use the variable watch option that comes inbuilt with some IDEs like visual studio. Its a handy tool if you know how to use it.460 ViewsRelated QuestionsMore Answers BelowWhat are the websites to find questions like find errors or cause of errors in Java code (basic/beginner level)?Is it a good practice to always throw exceptions for (both programming and expected input) errors and never handle error logic by returning er...How do I go about coding, if I know the logic for the same?I wrote a simple program for finding largest of two numbers. What is logical error in this program? Code is in description.How would I go about finding/hiring a coding tutor/teacher/mentor? Sagar Manjare, Django Developer in the making..Trying to get out of a boring job!Written 100w agoThere can be many such logical errors and its very difficult yo find such errors. As Saurabh Agarwal said dry running the code is the best option. Although I can list some ways and errors made commonly:1. Check the expression if any number/expression is divided by zero. (This the most common error)2. Check if you are accessing an array out of the limits i.e. array has index only till 5th and you are accessing 6th index (It gives array index out of bounds error or segmentation fault)3. If you do participate in competitive coding then you can often get wrong answer because you didn't print the result on new line i.e. "\n" is not used after printing the answer. Check your final print statements.4. Your answer is big and you use "int" instead of "double". Check your initializations. (This is also one of the most common errors)These are only some of the ways to find the errors. The list can go long once you start coding. These ways automatically come to your mind with continuous coding.P.S. I'll add more if I find out some more ways.420 Views · View Upvotes · Answer re