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Fortunately, the C compiler does not need to know about the complete
function definitions. You can provide the C compiler with the
information it needs to compile the main.c file by collecting
information about the trades.c file in a new header file
named trades.h:
/* Trades declaration file (h extension) */
/* Define the trade structure */
struct trade {double price; int number;};
/* Specify function prototypes */
double mean_price (struct trade **, int);
double mean_size (struct trade **, int);
Once you have constructed the trades.h file, your C compiler can
work on main.c as long as you provide access to the trades.h
file via an #include declaration in the main.c file:
... #include "trades.h" ...
As far as the C is concerned, it is as though the complete text of the included file appeared at the place where the inclusion occurs.