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Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Try catch statements in C up https://www.tutorialspoint.com/cprogramming/c_error_handling.htm vote 53 down vote favorite 17 I was thinking today about the try/catch blocks existent in another languages. Googled for a while this but with no result. From what I know, there is not such a thing as try/catch in C. However, is there a way to "simulate" them? Sure, there is assert and other tricks but nothing like try/catch, that also catch the raised exception. http://stackoverflow.com/questions/10586003/try-catch-statements-in-c Thank you c share|improve this question asked May 14 '12 at 15:07 Andrew 2,310103869 1 Exception-like mechanisms are not going to be generally useful without a mechanism to automatically free resources when the stack is unwound. C++ uses RAII; Java, C#, Python, etc. use garbage collectors. (And note that garbage collectors free only memory. To automatically free other types of resources, they also add things like finalizers or context managers...) –jamesdlin May 3 '15 at 5:34 @jamesdlin, Why couldn't we do RAII with C? –Pacerier May 15 '15 at 22:45 @Pacerier RAII requires calling functions automatically when objects are destroyed (i.e., destructors). How do you propose doing that in C? –jamesdlin May 15 '15 at 23:02 add a comment| 11 Answers 11 active oldest votes up vote 47 down vote accepted C itself doesn't support exceptions but you can simulate them to a degree with setjmp and longjmp calls. static jmp_buf s_jumpBuffer; void Example() { if (setjmp(s_jumpBuffer)) { // The longjmp was executed and returned control here printf("Exception happened\n"); } else { // Normal code execution starts here Test(); } } void Test() { // Rough equivalent of `throw` longjump(s_jumpBuffer, 42)
to be really useful in practice but it is a useful lesson about longjump and setjump with a fun example. http://www.di.unipi.it/~nids/docs/longjump_try_trow_catch.html Introduction Exception are a very powerful way to program error safe programs. Exceptions let you write straight code without testing for errors at each statement. In modern programming languages, https://msdn.microsoft.com/en-us/library/0yd65esw.aspx such as C++, Java or C#, exceptions are expressed with the try-throw-catch statement. ... try { ... /* error prone statements */ ... } catch(SomeExceptionType e) { ... /* in c do something intelligent here*/ ... } ... In previous example every exception raised by operations performed in try-block is passed to the right catch-black. If the exception type match SomeExceptionType than the code in that block is executed. Otherwise the exception is passed to the try-block that contains the actual one (if any). Our solution is not a fully handling in c functional try-throw-catch system. It does not forward exceptions from one block to one more external if no handler is provided. Real exception mechanisms need run-time support. We only want to explore the potentiality of longjmp and setjmp function with a non trivial example. Longjmp And SetJmp ANSI-C provide a lot of functions: math functions (log, sqrt...), string handling functions (strdup, strcmp, ...) and I/O functions (getc, printf, ...). All these functions are widely used and simple to understand (...strtok is not so intuitive after all...): only two functions are considered strange beasts. These functions are longjmp and setjmp. longjmp and setjmp are defined in setjmp.h header file... #include
resources Windows Server 2012 resources Programs MSDN subscriptions Overview Benefits Administrators Students Microsoft Imagine Microsoft Student Partners ISV Startups TechRewards Events Community Magazine Forums Blogs Channel 9 Documentation APIs and reference Dev centers Retired content Samples We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. C# Keywords Statement Keywords Exception Handling Statements Exception Handling Statements try-catch try-catch try-catch throw try-catch try-finally try-catch-finally TOC Collapse the table of content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. try-catch (C# Reference) Visual Studio 2015 Other Versions Visual Studio 2013 Visual Studio 2012 Visual Studio 2010 Visual Studio 2008 Visual Studio 2005 Visual Studio .NET 2003 The try-catch statement consists of a try block followed by one or more catch clauses, which specify handlers for different exceptions. RemarksWhen an exception is thrown, the common language runtime (CLR) looks for the catch statement that handles this exception. If the currently executing method does not contain such a catch block, the CLR looks at the method that called the current method, and so on up the call stack. If no catch block is found, then the CLR displays an unhandled exception message to the user and stops execution of the program.The try block contains the guarded code that may cause the exception. The block is executed until an exception is thrown or it is completed successfully. For example, the following attempt to cast a null object raises the NullReferenceException exception: C# Copy object o2 = null; try { int i2 = (int)o2; // Error } Although the catch clause can be used without arguments to catch any type of exception, this usage is not recommended. In general, you should only catch those exceptions that you know how to recover from. Therefore, you should always specify an object argument derived from System.Exception For example: C# Copy catch (InvalidCastException e) { } It is possible to use more than one specific catch clause in the same try-catch statement. In this case, the order of the catch clauses is important because the catch clauses are examined in order. Catch the more specific exceptions before the less specific ones. The compiler produces an error if you order your catch blocks so that a later block can never be reached.Using catch argume