Error Checking Program In C
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known as exception handling). By convention, the programmer is expected to prevent errors from occurring in the first place, and test return values from functions. For example, -1 and NULL are used in several functions such as socket() (Unix socket programming) or malloc() disk error checking program respectively to indicate problems that the programmer should be aware about. In a worst case use a disk error checking program scenario where there is an unavoidable error and no way to recover from it, a C programmer usually tries to log the error
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and "gracefully" terminate the program. There is an external variable called "errno", accessible by the programs after including
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Linux - in this case, the definition is in include/asm-generic/errno.h) when programs ask for resources. Such variable indexes error descriptions accessible by the function 'strerror( errno )'. The following code tests the return value from the library function malloc to see if dynamic memory allocation completed properly: #include
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C Atoi Error Checking
about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users prime number checking program in c Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping how to perform check disk each other. Join them; it only takes a minute: Sign up Error handling in C code up vote 102 down vote favorite 59 What do you consider "best practice" when it comes to error handling errors in a consistent https://en.wikibooks.org/wiki/C_Programming/Error_handling way in a C library. There are two ways I've been thinking of: Always return error code. A typical function would look like this: MYAPI_ERROR getObjectSize(MYAPIHandle h, int* returnedSize); The always provide an error pointer approach: int getObjectSize(MYAPIHandle h, MYAPI_ERROR* returnedError); When using the first approach it's possible to write code like this where the error handling check is directly placed on the function call: int size; if(getObjectSize(h, &size) != MYAPI_SUCCESS) { // Error handling } Which http://stackoverflow.com/questions/385975/error-handling-in-c-code looks better than the error handling code here. MYAPIError error; int size; size = getObjectSize(h, &error); if(error != MYAPI_SUCCESS) { // Error handling } However, I think using the return value for returning data makes the code more readable, It's obvious that something was written to the size variable in the second example. Do you have any ideas on why I should prefer any of those approaches or perhaps mix them or use something else? I'm not a fan of global error states since it tends to make multi threaded use of the library way more painful. EDIT: C++ specific ideas on this would also be interesting to hear about as long as they are not involving exceptions since it's not an option for me at the moment... c error-handling share|improve this question edited Nov 6 '13 at 19:09 ubershmekel 3,64013145 asked Dec 22 '08 at 10:46 Laserallan 6,71172956 add a comment| 17 Answers 17 active oldest votes up vote 50 down vote accepted I like the error as return-value way. If you're designing the api and you want to make use of your library as painless as possible think about these additions: store all possible error-states in one typedef'ed enum and use it in your lib. Don't just return ints or even worse, mix ints or different enumerations with return-codes. provide a function that converts errors into s
INDEX Basics of C Language Overview of C Features of C My First C program C Input / Output C Syntax Rules Keywords and Identifier Operators in C Language Data Types in C Variables in C Decision http://www.studytonight.com/c/error-handling-in-c.php Making Switch Statement Looping Arrays string and character array Storage classes Functions in C Introduction to Functions Types of Function calls Passing Array to function Structures in C Introduction to Structures Typedef Unions Pointers in C Pointers concept Declaring and initializing pointer Pointer to Array Pointer to Structure Pointer Arithmetic Pointer with Functions Advanced Topics in C File Input / Output Error Handling Dynamic memory allocation Command line argument C programs Find Factorial of a Number error checking Reverse a String Fibonacci Series Sum of Digits of a Number Sorting an Array element Swapping two Numbers Largest Number of an Array Pallindrome Program Remove Duplicate Element from Array Create and Write in File List all Files in Directory Find Size of a File Copy one File data into Another File Reverse Content of File Error Handling C language does not provide direct support for error handling. However few method and variable defined in error checking program error.h header file can be used to point out error using return value of the function call. In C language, a function return -1 or NULL value in case of any error and a global variable errno is set with the error code. So the return value can be used to check error while programming. C language uses the following functions to represent error perror() return string pass to it along with the textual represention of current errno value. strerror() is defined in string.h library. This method returns a pointer to the string representation of the current errno value. Example #include