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 3 of 6.
Arvind kumar said:
1 decade ago
It gives the address of memory location so we can use the specific value.
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?
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.
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.
Sirisha said:
1 decade ago
What is global function and why extern keyword used to declare a function?
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?
Radheshyam said:
1 decade ago
"Extern" is keyword in C ,suppose you write 2 diff. function in diff. file and main function in third file,
And you want one variable use globally eg. int a;
At that time we use extern keyword eg. extern int a;
This procedure same for function.
And you want one variable use globally eg. int a;
At that time we use extern keyword eg. extern int a;
This procedure same for function.
Ragaveni said:
1 decade ago
Variables which are declared before main function i.e. not in any function are called global variables.
Mumukshu said:
1 decade ago
The answer is incorrect. In C language, by default all function declarations are extern as C does not support local functions. Extern func(); and func(); are the same.
Preethe said:
1 decade ago
What is meant by global variables? please explain.
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