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C Language > Learn C Language > How can C programs run without header files?
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How can C programs run without header files?

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Freelance technical trainer / consultant (Embedded systems, Automation / Scripting) : C, Linux, Embedded systems, python, perl, tcl

The contents of them could be put directly in the source file (not recommended though). If is related to function prototype it will work with a warning, even if you do not put (but not always and not recommended).
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Passionate Developer

If already included in the environment
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Header files are used at compile time, the code gets inserted into the object/binary, you don't need them for running. But we do need all dynamic libraries used during linking for running the executable.
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