Difference between header file (.h) and cpp file (.cpp).

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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