Question

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

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

Answer 1

There is no difference between the two,except extern int fun(); is probably in another file.

Reason:-

extern int fun(); -> It is a declaration in C to indicate the existence of a global function and so is defined externally in another file.

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

Answer 2

[B].No difference, except extern int fun(); is probably in another file.

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.