Web Reference: Jul 23, 2025 · In C++ generally, we saw only a single file program but what if we have multiple source code files and we have to build a program by using all these files? Let's see how we can build a C++ program with multiple source files without including them as header files. There is no equivalent to including files in C#, so all you have to do boils down to compiling. Here is an example of two C# files in one folder which get compiled to one executable on Windows. When you are working on a large project you will inevitably want to break the program up into multiple source files, that is to say you will want to have multiple files with the .cpp extension that have code in them. You will also likely have multiple header files (.h or .hpp files).
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