Thread: Problem in string assignment

Hi,
I am facing a problem in assigning a '0' value to string in header file declaration.

I have a header file A.h

Code:

//A.h 

void show(const string s& = 0,int = 0 );

but here compiler is giving error as :

error: default argument for parameter of type 'const string&' has type 'int'

I am using gcc version 4.2.1 . I have also used NULL but the result were same.

Where is the problem ??

Can any body help ??