What does extern mean in a function declaration?

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What does extern mean in a function declaration?..

extern is significant only with data declarations. In
function declarations, it can be used as a stylistic hint
to indicate that the function's definition is probably in
another source file, but there is no formal difference
between

extern int f();

and
int f();

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91 Yes

14 No

What does extern mean in a function declaration?..

Answer / poornima

extern is a keyword that is prefixed in function
declaration. It means tht function definition is in source
file.
for eg.
source file contains int sum(int x,int y) definition part.
To make use of this function in file by simply declare as
extern int sum(int ,int); is a good practice.
But to compiler happy extern sum(); is enough.

Is This Answer Correct ?

34 Yes

16 No

What does extern mean in a function declaration?..

Answer / zxg

(from MSDN)
Functions declared as extern are visible throughout all source files in the program (unless you later redeclare such a function as static). Any function can call an extern function.

Function declarations that omit the storage-class specifier are extern by default.

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4 Yes

3 No

What does extern mean in a function declaration?..

Answer / aravind

Extern is nothing but a memory storage type.If we declare extern before the function than the variable can be accessed by that function not only locally but externally too.
extern int a=4
Int fun (int x)
{
x=a;
print gives a=4

Is This Answer Correct ?

8 Yes

19 No

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