|
|
|
|
|
|
|
Now the question is, Where should you define the mode global
variable? A reasonable answer is that you should put it in its own
file inasmuch as speed-versus-accuracy control is a conceptual unit.
Wherever you define the mode variable, you face what seems like a
paradox: You use the value of the mode variable in both the
main.c file and the trades.c file, but you can define a
variable in only one place, just as you can define a function in only one
place. But if you define a variable in just one file, how does the C
compiler learn what it needs to know about that variable while it is
compiling another file that references the variable?