Answer / manoj

By using EXTRN.
Example:
File 1:

int GlobalVariable; // implicit definition
void SomeFunction(); // function prototype
(declaration)

int main() {
GlobalVariable = 1;
SomeFunction();
return 0;
}

File 2:

extern int GlobalVariable; // explicit declaration

void SomeFunction() { // function header (definition)
++GlobalVariable;
}

every function has return the value?

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