![]() Header files marked with the #include preprocessor directive can add a lot of lines to the code the more header files you include, the longer the preprocessed output file becomes. For #include directives, it replaces the contents of the corresponding files, which are usually just declarations. In the case of #define directives, the compiler replaces macros while with #if, #ifdef, and #ifndef directives, the compiler selects different parts of the text. In C++, preprocessor directives begin with a # (hash) symbol examples of some preprocessor directives are #include, #define, and #if. In the preprocessor stage, the compiler works with one C++ source file at a time. The compilation process is fairly complex and can be divided into three steps: Preprocessingīefore the actual compilation, the preprocessor directives instruct the compiler to prepare the source code by temporarily expanding it. The compiler bridges the gap between high-level C++ and machine language by converting your C++ source code into a binary file that computers can execute. Being a high-level programming language, C++ makes coding easier for programmers the nuts-and-bolts nature of low-level machine language makes it hard to write useful programs of sufficient complexity for the modern era of computing. Let’s cast some light on the black box of compilation by explaining in simple terms what a C++ compiler does. The inner workings of the compiler can provide deep insights and improve your programming skills by helping you avoid common errors. ![]() The topic is worth learning about, and this article contains some of the most important details that you’ll want to know. But have you ever taken a look behind the scenes to find out what happens during compilation? By this point you may have tackled topics like multi-threading and parallel programming. As a C++ developer, you’ve mastered a high-performance programming language used to create applications in the world’s most exciting fields-from data mining and big data to self-driving cars and robotics to gaming and video.
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