Recursive Square root function in C++

/*
QUESTION:
Write Recursive square root function


CODE:
*/

#include<iostream.h>   

double sqrt( int n,int rep=0)

{ 

static double x=1;

if(n<=rep)

 return 0;

else

{ 

x=0.5*(x+n/x);

 sqrt(n,++rep);

} 

return x;

 }  

int main()

{

int a;

cout<<"enter the a"<<endl;

cin>>a;

cout<<sqrt(a)<<endl;

}