// Code derived from Stroustrup's PPP2 book
// § 8.2 Declarations and definitions
//  -and beginning on p 257

struct Token {};

int a = 7;  // an int variable

const double cd = 8.7;  // a double-precision floating-point constant

double my_sqrt(double);  // a function taking a double argument
                         //  and returning a double result

vector<Token> v;  // a vector-of-Tokens variable

int main()
{
  // Before a name can be used in a C++ program, it must be declared
  cout << f(i) << '\n';
}