Broken example for streambuf::in_avail

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Hi,

When running the example specified under
http://www.cplusplus.com/reference/iostream/streambuf/in_avail.html
(Example is included below.)
I don't get the expected answer.

# ./in_avail_prog
Please enter some characters: asdf
The first character you entered is: a 0 additional characters in input buffer

Is it something compiler specific, or where do I go wrong?
I'm using sparc-sun-solaris2.9-gcc (GCC) 4.1.2

// in_avail () example
#include <iostream>
using namespace std;

int main () {

streamsize size;
char ch;

streambuf * pbuf;
pbuf = cin.rdbuf();

cout << "Please enter some characters: ";
cin >> ch;

size = pbuf->in_avail();

cout << "The first character you entered is: " << ch << endl;
cout << size << " additional characters in input buffer" << endl;

return 0;
}


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