Pass by refrence, example with alternatives

passByRefAlternatives.cpp

#include <iostream>
#include <utility>


using namespace std;

void getHoursRate(double &hours, double &rate) 
{
  cout << "enter hours:" << endl;
  cin >> hours;
  cout << "enter rate:" << endl;
  cin >> rate;
}

void getHoursRate2(double *hours, double *rate) 
{
  cout << "enter hours:" << endl;
  cin >> *hours;
  cout << "enter rate:" << endl;
  cin >> *rate;
}



struct HoursAndRate
{
  double hours;
  double rate;
};

HoursAndRate getHoursRate3() 
{
  HoursAndRate input;
  cout << "enter hours:" << endl;
  cin >> input.hours;
  cout << "enter rate:" << endl;
  cin >> input.rate;
  return input;
}

pair<double,double> getHoursRate4() 
{
  pair<double,double> userInput;
  cout << "enter hours:" << endl;
  cin >> userInput.first;
  cout << "enter rate:" << endl;
  cin >> userInput.second;
  return userInput;
}

int main() 
{
  double hours;
  double rate;

  // method 1

  getHoursRate(hours,rate);
  cout << "hours is " << hours << " and rate is " << rate << endl;

  // method 2


  getHoursRate(hours,rate);
  cout << "hours is " << hours << " and rate is " << rate << endl;

  // method 3

  HoursAndRate userInput = getHoursRate3();
  cout << "hours is " << userInput.hours << " and rate is " << userInput.rate << endl;

  // method 3

  pair<double, double> pair = getHoursRate4();
  cout << "hours is " << pair.first << " and rate is " << pair.second << endl;

  return 0;
}