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Is there any difference between following declarations? 1 : extern int fun(); 2 : int fun();

Both are identical
No difference, except extern int fun(); is probably in another file
int fun(); is overrided with extern int fun();
None of these

Correct Answer: No difference, except extern int fun(); is probably in another file

Explanation:

extern int fun(); declaration in C is to indicate the existence of a global function and it is defined externally to the current module or in another file.

int fun(); declaration in C is to indicate the existence of a function inside the current module or in the same file.

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