nvoid Increment(int& n); // function declaration
n void Increment(int&
n){ // function definition
n cout << x << " ~~~ " <<
Increment(x) << Increment(6) << endl;
nIncrement(x) : the function call does not result in any usable data
value and so cannot be used in any
computation or in the output stream.
nIncrement(6) : cannot convert parameter 1 from
'const int' to 'int &'