Can i cast char* to a unsigned char* or vice versa ?

No boss , we can not cast char* to a unsigned char* or vice versa.
The reason is , lets first understand static_cast .

Few points about stati cast listed below
1) Only allowed for conversions which the compiler can check
2) we can not use static_cast to a pointer to a non-pointer
3) we can not use static_cast to remove constness(orvolatileness)
4) we can not use static_cast from a virtual base class
5) Static_cast is only for related types.pointer type (remember pointer type, it works fine for general primitive data type i.e int,char ,float)

So here Char* and unsigned char* are two unrelated pointer types. One more thing ,here one of the pointer is void * then we can do it.
Lets have an example,
#include
using namespace std;


void uchar_f1(unsigned char *x)
{
cout<<"uchar_f1 "<< x <<"\n";
}

void char_f1(char *x)
{
cout<<"char_f1"<< x << "\n";
}int main()
{
unsigned char uc[]={ 'A' , 'B' , 'C' };
uc[3]='\0';
char c[]={ '1' , '2' , '3'};
c[3]='\0';
uchar_f1(uc);
char_f1(c);
uchar_f1(static_cast(c));

}

If we write uchar_f1(static_cast(static_cast(c)));

So this will work.
Cheer,
sahu