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Why multi-file C++ programs fail in online compilers and how to fix them

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Many online C++ compilers accept only a single editor file, so a program split into a header and source file fails with a missing-header error. Pasting only the header does not help, because the member function definitions live in the .cpp file, which then triggers linker errors. The article explains that the program must compile and link all source files together. It shows an example Student class split across header and source files, and notes rules such as exact filename matching, folder support, and file limits on one platform. It also describes how to submit multiple files through an API using Python.

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