// Very simple example - illustrates an alias e of d in a function f.

#include <iostream>
#include <string>
using namespace std;

double f(double di = 6.0){
  double d = di,  // d initialized to the value of the parameter di
         &e = d;  // e is an alias to d

  e += 7.0;       // increasing e, and hereby d, by 7
  return d;
}

int main(){
  cout << f() << endl;   // 13
  cout << f(8) << endl;  // 15
}