How To Solve Undefined Reference Error In C
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Undefined Reference To A Function C++
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Undefined Reference To Function In C Error
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 undefined reference error in c compilation 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 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 undefined reference to function error in c++ 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 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
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Practice Problems Quizzes Resources Source Code Source Code Snippets C and C++ Tips Finding a Job References Function Reference Syntax Reference Programming FAQ Getting Help Message Board Email About Us Dealing with Compiler Errors - Surviving the Compilation Process By Alex Allain It's your first C (or C++) program--it's not that long, and you're about to compile it. You hit compile (or enter the build command) and wait. Your compiler spits out fifty lines of text. You pick out words like "warning and "error". Does that mean it worked? you wonder. You look for the resulting executable. Nothing. Damn, you think, I guess I have to figure out what this all means... The Types of Compilation Errors First, let's distinguish between the types of errors: most compilers will give three types of compile-time alerts: compiler warnings, compiler errors, and linker errors. Although you don't want to ignore them, compiler warnings aren't something severe enough to actually keep your program from compiling. Usually, compiler warnings are an indication that something might go wrong at runtime. How can the compiler know this at all? You might be making a typical mistake that the compiler knows about. A common example is using the assignment operator ('=') instead of the equality operator ('==') inside an if statement. Your compiler may also warn you about using variables that haven't been initialized and other similar mistakes. Generally, you can set the warning level of your compiler--I like to keep it at its highest level so that my compiler warnings don't turn in to bugs in the running program ('runtime bugs'). Nevertheless, compiler warnings aren't going to stop you from getting your program working (unless you tell your compiler to treat warnings as errors), so they're probably a bit less frustrating than errors. Errors are conditions that prevent the compiler from completing the compilation of your files. Compiler errors are restricted to single source code files and are the result of 'syntax errors'. What this really means is that you've done something that the compiler cannot understand. For instance, the statement "for(;)" isn't correct syntax because a for loop always needs to have three parts. Although the compiler would have expected a semicolon, it would also have expected a conditional expression, so the error message you get might be something like "line 53, unexpected parenthesis ')'". Not