Ansi C #error
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C - Basic Syntax C - Data Types C - Variables C - Constants C - Storage Classes C - Operators C - Decision Making C - Loops C - Functions C #error in c example - Scope Rules C - Arrays C - Pointers C - Strings C -
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Structures C - Unions C - Bit Fields C - Typedef C - Input & Output C - File I/O C
Error Directive Must Use C++ For The Type Iostream
- Preprocessors C - Header Files C - Type Casting C - Error Handling C - Recursion C - Variable Arguments C - Memory Management C - Command Line Arguments C Programming Resources C
#error C
- Questions & Answers C - Quick Guide C - Useful Resources C - Discussion Selected Reading Developer's Best Practices Questions and Answers Effective Resume Writing HR Interview Questions Computer Glossary Who is Who C - Error Handling Advertisements Previous Page Next Page As such, C programming does not provide direct support for error handling but being a system programming language, it provides you access at lower level in #error gcc the form of return values. Most of the C or even Unix function calls return -1 or NULL in case of any error and set an error code errno. It is set as a global variable and indicates an error occurred during any function call. You can find various error codes defined in
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 #warning in c 9 Documentation APIs and reference Dev centers Retired content Samples We’re #error c preprocessor sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. C/C++ Preprocessor Reference #error c++ Preprocessor Preprocessor Directives Preprocessor Directives #error Directive #error Directive #error Directive #define Directive #error Directive #if, #elif, #else, and #endif Directives #ifdef and #ifndef Directives #import Directive #include https://www.tutorialspoint.com/cprogramming/c_error_handling.htm Directive #line Directive Null Directive #undef Directive #using Directive 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. #error Directive (C/C++) Visual Studio 2015 Other Versions Visual Studio 2013 Visual Studio 2012 Visual Studio 2010 Visual Studio https://msdn.microsoft.com/en-us/library/c8tk0xsk.aspx 2008 Visual Studio 2005 Visual Studio .NET 2003 The #error directive emits a user-specified error message at compile time and then terminates the compilation.Syntax Copy #errortoken-string RemarksThe error message that this directive emits includes the token-string parameter. The token-string parameter is not subject to macro expansion. This directive is most useful during preprocessing for notifying the developer of a program inconsistency or the violation of a constraint. The following example demonstrates error processing during preprocessing: Copy #if !defined(__cplusplus) #error C++ compiler required. #endif See AlsoPreprocessor Directives Show: Inherited Protected Print Export (0) Print Export (0) Share IN THIS ARTICLE Is this page helpful? Yes No Additional feedback? 1500 characters remaining Submit Skip this Thank you! We appreciate your feedback. Dev centers Windows Office Visual Studio Microsoft Azure More... Learning resources Microsoft Virtual Academy Channel 9 MSDN Magazine Community Forums Blogs Codeplex Support Self support Programs BizSpark (for startups) Microsoft Imagine (for students) United States (English) Newsletter Privacy & cookies Terms of use Trademarks © 2016 Microsoft © 2016 Microsoft
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us http://stackoverflow.com/questions/5559250/c-error-undefined-reference-to-function-but-it-is-defined Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the 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 C error: undefined reference to function, but it IS defined up vote 23 down vote favorite 8 Just a simple program, but I keep getting this compiler error. I'm using MinGW for the compiler. Here's the header file, point.h: //type for a Cartesian #error c point typedef struct { double x; double y; } Point; Point create(double x, double y); Point midpoint(Point p, Point q); And here's point.c: //This is the implementation of the point type #include "point.h" int main() { return 0; } Point create(double x, double y) { Point p; p.x = x; p.y = y; return p; } Point midpoint(Point p, Point q) { Point mid; mid.x = (p.x + q.x) / 2; mid.y = (p.y + q.y) / 2; return mid; } And here's where the ansi c #error compiler issue comes in. I keep getting: testpoint.c: undefined reference to 'create(double x, double y)' While it is defined in point.c. This is a separate file called testpoint.c: #include "point.h" #include