Thus, you must include the trades.h
header file in both the
main.c
and the trades.c
files:
trades.h *--------------* | Structure | ----------* | declaration | | | and | | | function | | | prototypes | | *--------------* | | main.c trades.c | *----------------------* *----------------------* | | #include "trades.h" | | #include "trades.h" | | | ... |<---* | ... |<--| *----------------------* | *----------------------* | *-----------------------------*