One extern usage

[newsock]

What's the implied meaning of using extern below?

extern int main(void)
{
...
}

 

[Richard Heathfield]

What's the implied meaning of using extern below?

extern int main(void)
{
...
}

It's identical to:

int main(void)
{
...
}

and I presume you already know what that means.

 

[Rick]

Doesn't extern imply that the function or variable or whatever that's
being extern'd is externally defined some place? Does writing extern
like this have any possible side effects? What if it was written against
some variable?

It's identical to:

int main(void)
{
...
}

and I presume you already know what that means.

Thanks

Rick

 

[Dan Pop]

Doesn't extern imply that the function or variable or whatever that's
being extern'd is externally defined some place? Does writing extern
like this have any possible side effects? What if it was written against
some variable?

On function declarations/definitions, extern is the default and
explicitly mentioning it makes no differences.

On object declarations, extern prevents the declaration from becoming
a tentative definition.

Dan