endl defined in std namespace (std::endl), inserts a newline character into the output sequence and flushes it.
Header files (.h) provide information that will be required in multiple files or in a module. Class declarations, function prototypes and enumerations typically go in header files.
//function.h void print_factorial(int n); int factorial(int n);
Code files (.cpp) contains the implementation that only needs to be known in one file. Function bodies and internal variables are implmented in .cpp files.
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