How do I share a global variable between c files?

Question

If i define a global variable in a .c file, how can i use the value of the same variable in another .c file?

file1.c

#incl         


        

Answer 1

Use the extern keyword to declare the variable in the other .c file. E.g.:

extern int counter;

means that the actual storage is located in another file. It can be used for both variables and function prototypes.