C Programming - Declarations and Initializations

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Is the following statement a declaration or definition?
extern int i;

Declaration

Definition

Function

Error

Identify which of the following are declarations

1 : extern int x;

2 : float square ( float x ) { ... }

3 : double pow(double, double);

1 and 3

In the following program where is the variable a getting defined and where it is getting declared?

#include<stdio.h>
int main()
{
    extern int a;
    printf("%d\n", a);
    return 0;
}
int a=20;

extern int a is declaration, int a = 20 is the definition

int a = 20 is declaration, extern int a is the definition

int a = 20 is definition, a is not defined

a is declared, a is not defined

When we mention the prototype of a function are we defining the function or declaring it?

Defining

Declaring

Prototyping

Calling

What's the difference between following declarations?

1 : extern int fun();

2 : int fun();

extern int fun(); is in another file

No difference, except extern int fun(); is in another file

int fun(); is overrided with extern int fun();

None of these

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