#include <iostream> 
using namespace std;
 
double& array_value(double array[], int i ) {
   return array[i];   // return a reference to the ith element
}
 
int main () {
  
  double vals[] = {10.1, 12.6, 33.1, 24.1, 50.0};
 
   cout << "Array before change" << endl;
   for ( int i = 0; i < 5; i++ ) {
      cout << "vals[" << i << "] = ";
      cout << vals[i] << endl;
   }
 
   array_value(vals, 1) = 20.23; // αλλαγή του 2ου στοιχείου
   array_value(vals, 3) = 70.8;  // αλλαγή του 4ου στοιχείου
 
   cout << "Array after change" << endl;
   for ( int i = 0; i < 5; i++ ) {
      cout << "vals[" << i << "] = ";
      cout << vals[i] << endl;
   }

   return 0;
}