cin.seekg() problem

[pantatkau]

i am trying to use the seekg(offset, base) function to move the read position but cant seem to do it correctly. When i use tellg() to know if the seekg operation is
successful or not , the tellg() will always return -1. Heres the code.

#include <iostream>

using namespace std;



int main()
{

char ch;

cin.get();

cin.seekg(0, ios::end);

cout<<cin.tellg();


system("PAUSE");
return 0;
}




Please help me out .. i cant sleep like this :(

[Banfa]

using seek and tell works on files but not on the standard input and output streams because there is no-where to seek to on an input or output stream.