Include directive - Wikipedia
https://en.wikipedia.org/wiki/Include_directive
Now, every time the code is compiled, the latest function prototypes in add.h will be included in the files using them, avoiding potential errors.. Language support C/C++. In the C and C++ programming languages, the #include preprocessor directive causes the compiler to replace that line with the entire text of the contents of the named source file (if included in quotes: "") or …
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