The C++ build system (compiler) knows no difference, so it’s all one of conventions. The convention is that .h files are declarations, and .cpp files are definitions. That’s why .h files are #included — we include the declarations.
This errors says your function is already defined ; which can mean : you have the same function defined in two files or you have the same function defined in two places in the same file or the file in which your function is defined is included two times (so, it seems the function is … Read more
The problem is solved. I just moved one of #include from the header to the source file, and it has worked. plotmarker.h // … plotmarker.cpp
The problem here is that you are including commands.c in commands.h before the function prototype. Therefore, the C pre-processor inserts the content of commands.c into commands.h before the function prototype. commands.c contains the function definition. As a result, the function definition ends up before than the function declaration causing the error. The content of commands.h … Read more
random is not a standard C++ function; it’s a POSIX function, so it’s not available on Windows. Use rand instead, or better, the new C++11 randomness library.
The old versions of JavaScript had no import, include, or require, so many different approaches to this problem have been developed. But since 2015 (ES6), JavaScript has had the ES6 modules standard to import modules in Node.js, which is also supported by most modern browsers. For compatibility with older browsers, build tools like Webpack and Rollup and/or transpilation tools like Babel can be used. … Read more
You don’t #include in Java, you import package.Class. Since Java 6 (or was it 5?), you can also import static package.Class.staticMethodOfClass, which would achieve some forms of what you’re trying to do. Also, as @duffymo noted, import only saves you from systematically prefixing the imported class names with the package name, or the imported static … Read more
This is not a compiler error: the error is coming from the linker. After compilation, the linker will merge the object files resulting from the compilation of each of your translation units (.cpp files). The linker finds out that you have the same symbol defined multiple times in different translation units, and complains about it … Read more
The common circular include problem occurs with:a.h b.h If some cpp includes “a.h” you might get away with it (if b.h didn’t really need a.h). But if that cpp instead includes b.h then b.h includes a.h BEFORE declaring things needed by a.h. Then a.h tries to include b.h but the include guard blocks that, so the compiler … Read more
Ok, thanks for the more specific info, ppl may remove their downvotes now… What you are proposing is a very common thing to do! You want to run your web application locally without uploading it to your host yet. That’s totally fine and that’s what your Apache is there for. Your Apache is a web … Read more