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For example, you might want to add a
prediction function, predict, that
predicts the price of trade n, given the prices of trades 0
through n-1. You would add the definition of predict, along
with definitions for any auxiliary functions, to the trades.c file.
You would also augment the trades.h header file with a function
prototype for the predict function. Assuming that your
implementation of predict has two parameters—one for a pointer to
the trades array and one for the number of trades accumulated in the
array—then the addition to the trades.h file would be as follows:
double predict (struct trade **, int);
You do not need to include function prototypes for any auxiliary functions, assuming that those auxiliary functions are not called from functions in other files.