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4
By default, both definitions of variable x are public. Thus, when you compile and link the program and module units, references to x refer to the same variable, as follows:
hostname% pc program_unit3.p module_unit3.p program_unit.p:
module_unit.p: Linking: hostname% a.out
Hello, world for the 1 time. Hello, world for the 2 time. Hello, world for the 3 time. Hello, world for the 4 time. Hello, world for the 5 time.
If you compile the program giving the
hostname% pc
module_unit.p: Linking: hostname% a.out
Hello, world for the 0 time. Hello, world for the 0 time. Hello, world for the 0 time. Hello, world for the 0 time. Hello, world for the 0 time.
You can get the same effect by explicitly declaring the variable in a private var section. Similarly, when you use
As with routine declarations, it is often a good idea to declare public variables in an include file. Doing so makes it easier to keep your declarations consistent.
There are other methods for making variables visible to different units. See Chapter 5, “Separate Compilation,” for more information.
Program Construction and Management | 73 |