C Programming - Declarations and Initializations - Discussion

Discussion Forum : Declarations and Initializations - General Questions (Q.No. 10)

Declarations and Initializations

10.

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

Answer: Option

Explanation:

- During declaration we tell the datatype of the Variable.

- During definition the value is initialized.

Discussion:

46 comments Page 5 of 5.

Vishu said: 9 years ago

@Prathyusha.

You are right, answer A is corret.

Aman said: 8 years ago

a is defined outside the scope of the program. It will not even get executed.

Shital said: 7 years ago

If int a=20; is definition, then what about if we say int a=20; is initialisation?

(1)

Shubham said: 4 years ago

What is the output of this program? Please anyone explain.

Aniket said: 2 years ago

It shows an error msg because extern are declared inside the function.

(1)

Ajmer thakur said: 9 months ago

The datatype of int is extern so is cancelled to be defined anywhere in the code.

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