Question

What is tha difference in declearing global variable and extern?

Answer 1

A global variable is variable, which is accessible from anywhere in the file you defined it in. An extern variable is a global variable which is accessible in other files too.... In order to do this, variable must be declared in both files, but the keywords extern must precede the "second" declaration.

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Answer 2

A global variable is variable, which is accessible from anywhere in the file you defined it in. An extern variable is a also a global variable which is accessible in other files too. ... In order to do this, the variable must be declared in both files, but the keyword extern must precede the "second" declaration.