C traps and defects note-extern

Create a file named a.h, which contains the declaration:

Extern int I;

Each C of the External Object filename needs to be used.Source codeYou should add the following statement:

# Include "a. h"

Finally, we select a C source file, in which the initial value of I is given. We call this file a. c.

# Include <stdio. h> # include ". H "int I = 8; int main (void) {printf (" % d \ n ", I); return 0 ;}

As long as the declarations in the source file are consistent and only one of these declarations is the definition of I, the write is legal.

So the aboveCodeCan be correctly compiled and executed.