Question
Is the following statement a declaration or definition?
extern int i;
Answer: Option A
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Declaring is the way a programmer tells the compiler to expect a particular
type, be it a variable, class/struct/union type, a function type (prototype) or
a particular object instance. (ie. extern int i)
Declaration never reserves any space for the variable or instance in the
program's memory; it simply a "hint" to the compiler that a use of the variable
or instance is expected in the program.This hinting is technically called "forward
reference".
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