Answers/Solutions to Exercises in Chapter 2, Exercise 1

E1: Can a global variable be defined in a C/C++ program that is not accessible by a certain function?

A1: Yes. There are two possible situations. If a variable is defined outside any function or a class, it is global (since it is not local to any block). It may not be accessible from any function of the program that is located in a different source file (we say may not be accessible for it may --- do you know how to make it accessible?) . It will not be accessible from any function located within the same source file but located above the place of definition. For instance

variable x is global in the program separated into two source files, x1.c and x2.c. The variable is not accessible in A(), it is accessible in B(), not accessible in C() nor D().

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