A(n) ____ declaration statement simply informs the computer that a global variable already exists and can now be used.
A) auto
B) static
C) extern
D) global

Question

Quizplus · Accepted Answer

The keyword "extern" is used to declare a global variable that has already been defined somewhere else in the program. This tells the compiler that the variable has external linkage and can be accessed by other parts of the program. The other options are not applicable to declaring a pre-existing global variable. The extern declaration statement is used to inform the compiler that a global variable has already been defined in another part of the program or in a different source file. This allows the variable to be used in the current code without causing a compilation error.

A(n) ____ Declaration Statement Simply Informs the Computer That a Global