#include <iostream> using namespace std; double up (double x) {return 2.0* x;} void r1 (const double &rx) {cout << "const double & rx\n";} void r1 (double &7rx) {cout <<"double && rx\n";} int main() { double w =10.0 ; r1(w); r1(w+1); r1(up(w)); return 0; }