self doubt

Question

What is the output of the program:

extern int a;

main()

{

     extern int a;

     printf(a);

}

Comments

what is ur dobt here ???

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what would be the output ?

Answer 1

It will throw a compile time error which would look something like : 

undefined reference to `a'

because extern variable declarations look for a variable defined with the same name defined globally.

Comments

@logan1x, @Vikas Verma

it's not compilation error, it's linking error !

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Can you mention your source please? like host the code on geeksforgeeks IDE and share the link here?

Answer 2

It will generate compilation error 

undefined symbol a 

But if declaration is done at global a like

extern int a= 5;

Then there will be no error and it will print 5.

Answer 3

it will print global variable a with same defined in main function . no need of externl in global declartion