C Programming - Declarations and Initializations - Discussion
Discussion Forum : Declarations and Initializations - General Questions (Q.No. 4)
4.
Is there any difference between following declarations?
| 1 : | extern int fun(); |
| 2 : | int fun(); |
Answer: Option
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.
Discussion:
56 comments Page 4 of 6.
Eshwar said:
1 decade ago
Hi,
How is extern function different from normal function?
If a function is declared as extern, then that function can be overrided?
How is extern function different from normal function?
If a function is declared as extern, then that function can be overrided?
Sirisha said:
1 decade ago
What is global function and why extern keyword used to declare a function?
Vijay sawant said:
1 decade ago
extern int a;
extern keyword tell the compiler, identifier a of type integer define anywhere through the program. This statement is just declaration.
extern keyword tell the compiler, identifier a of type integer define anywhere through the program. This statement is just declaration.
Vijay said:
1 decade ago
@Ragveni.
Global variable means that the variable which are defined outside all the blocks of functions, anywhere in file (not only before main).
main()
{
pf("hello");
}
int a;
a is global variable.
Global variable means that the variable which are defined outside all the blocks of functions, anywhere in file (not only before main).
main()
{
pf("hello");
}
int a;
a is global variable.
Shyojee ram meena said:
1 decade ago
Declaration means that the variable exist in program :-
#include<stdio.h>
main()
{
int a;
printf("%d",&a);
return 0;
}
Why it gives address of memory location?
#include<stdio.h>
main()
{
int a;
printf("%d",&a);
return 0;
}
Why it gives address of memory location?
Arvind kumar said:
1 decade ago
It gives the address of memory location so we can use the specific value.
Arzoo said:
1 decade ago
Please explain function using extern keyword with proper example.
Adithya said:
1 decade ago
Oh horrible explanation. By declaring a variable as an extern, you just tell the compiler that a variable has been declared. Without an extern, something like this:
int x;
The compiler declares as well as defines (i.e, allocates memory to the variable x). No wonder why extern is used in declaring a variable that's gonna be used across various files.
int x;
The compiler declares as well as defines (i.e, allocates memory to the variable x). No wonder why extern is used in declaring a variable that's gonna be used across various files.
Raj said:
1 decade ago
Can anyone tell me how can we access one C program to another one with external variable.
Revathi said:
10 years ago
What is the different between normal function and extern function?
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