Compile Time Error Logical Error
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Syntax Error Logical Error Runtime Error
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Types Of Errors In Computer Programming
and compiler error? [duplicate] up vote 14 down vote favorite 7 This question already has an answer here: Runtime vs Compile time 19 answers In one of my prof slides on ploymorphism, I see this piece of code with a couple of comments: discountVariable = //will produce (DiscountSale)saleVariable;//run-time error discountVariable = saleVariable //will produce //compiler error As you can see, it says in the first casting statement 3 types of errors in java programming that it'll produce run-time error and in the other one it says it'll produce compiler error. What makes these errors? and how they differ from each other? java compiler-errors share|improve this question edited Nov 16 '12 at 21:10 The Unfun Cat 4,23374064 asked Feb 27 '12 at 20:31 AbdullahR 1982414 marked as duplicate by assyliasjava Users with the java badge can single-handedly close java questions as duplicates and reopen them as needed. Jan 26 at 17:52 This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question. 15 Come on guys. The guy is trying to learn, downvotes are unnecessary. –JohnFx Feb 27 '12 at 20:35 3 Doesn't matter if it has addressed my example or not, what really matters is that I got the answer clearly. That guy explained it in a simple way that can be easy to understand to a naive programmer like me. –AbdullahR Feb 27 '12 at 20:54 Did you read the stackoverflow.com/faq ? –user647772 Feb 27 '12 at 21:00 Thank you AbdullahR, I hoped that from my example you could comprehend the diffe
Fatal Errors Logic Errors Note that the error messages shown below may be specific to our compiler/linker or machines. Nonetheless, other systems https://www.cs.bu.edu/teaching/cpp/debugging/errors/ and compilers will provide similar information. Compiler Messages When the https://blog.penjee.com/what-are-the-2-types-of-errors-in-programming/ compiler is compiling your code (i.e., converting your code into instructions the machine understands), it will report problems that it finds in your code. Aside: Here, we are being technical and refer to compiling as the stage before linking. Linking is when all time error the compiled pieces of a program and the libraries it uses (e.g., for cin) are put together to form an executable. Often, compiling and linking together are just referred to as compiling. There are two severities of messages the compiler can give: Compiler Warnings A compiler warning indicates you've done something bad, but not compile time error something that will prevent the code from being compiled. You should fix whatever causes warnings since they often lead to other problems that will not be so easy to find. Example: Your code calls the pow() (raise to a power) library function, but you forgot to include math.h. Because you've supplied no prototype for the pow() function (its in math.h), the compiler warns you that it assumes pow() returns an int and that it assumes nothing about pow()'s parameters: somefile.cpp:6: warning: implicit declaration of function `int pow(...)' This is a problem since pow() actually returns a double. In addition, the compiler can't type-check (and possibly convert) values passed to pow() if it doesn't know how many and what type those parameters are supposed to be. Note: The compiler will label warnings with the word warning so that you can distinguish them from errors. Compiler Errors A compiler error indicates something that must be fixed before the code can be compile
errors in computer programming. We are going to look at the two most general types of errors. At the bottom of this post, we do address a third type of error that is sometimes studied. 2 General Categories of Computer Programming Error Types Logic Error - Is a type of bug that has two criteria Does not prevent the program from running (or at least starting) . While it is possible that a logic error might, eventually, cause your program to crash, your program will at least start up and begin running with that logic error. leads to unexpected results. Below is an animation of a logic error in Penjee. As you can see the program starts correctly but because we turned the wrong way, we end up crashing into a wall-these were unexpected results for the programmer when she first wrote that code. We cover logic errors in depth here . Example of a Logic Error Syntax Error- Exactly what it sounds like! You messed up some language's syntax . Maybe you forgot to put a colon or a semicolon somewhere in a Python script or maybe, in Java or C++, you forgot a semicolon . Pretty much every programming language goes through a parser, and all syntax errors can be detected by the parser. Let's look at some examples of syntax errors. In the first example below, the print statement would have worked in the old version of Python (python 2), but one of the big changes that came with Python 3 was the new requirement to put parenthesis around the argument. Python # python 3 Syntax Error message = "Penjee is for Python" print message #the above code would have worked in Python 2 before parenthesis became required 12345 #python 3 Syntax Errormessage = "Penjee is for Python"print message#the above code would have worked in Python 2 before parenthesis became required Java // JAVA Syntax error // no semicolon o