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

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Answer 1

If you want to use global variable i of file1.c in file2.c, then below are the points to remember:

1. main function shouldn't be there in file2.c
2. now global variable i can be shared with file2.c by two ways:
   a) by declaring with extern keyword in file2.c i.e extern int i;
   b) by defining the variable i in a header file and including that header file in file2.c.