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  1. #include <iostream>
  2.  #include <iomanip>
  3.  using namespace std;
  4.  
  5.  class Population
  6.  {
  7.  private:
  8.  int pop;
  9.  int births;
  10.  int deaths;
  11.  
  12.  public:
  13.  void setPopulation (int);
  14.  void setBirths(int);
  15.  void setDeaths(int);
  16.  
  17.  int getPopulation();
  18.  double getBirthRate(); 
  19.  double getDeathRate(); 
  20.  
  21.  Population() : pop(0), deaths(0), births(0) {}
  22.  };
  23.  
  24.  void Population::setPopulation(int p)
  25.  {
  26.  pop = p;
  27.  }
  28.  
  29.  void Population::setBirths(int B)
  30.  {
  31.  births = B;
  32.  }
  33.  
  34.  void Population::setDeaths(int d)
  35.  {
  36.  deaths = d;
  37.  }
  38.  
  39.  int Population::getPopulation()
  40.  { 
  41.  return pop;
  42.  }
  43.  
  44.  double Population::getBirthRate()
  45.  { 
  46.  return births / static_cast<double>(pop);
  47.  }
  48.  double Population::getDeathRate()
  49.  { 
  50.  return deaths / static_cast<double>(pop); 
  51.  }
  52.  
  53.  
  54.  int main()
  55.  {
  56.  Population Town; 
  57.  int People;
  58.  int Births,
  59.  Deaths;
  60.  
  61.  cout << "Enter total population: ";
  62.  cin >> People;
  63.  while (People < 1)
  64.  { cout << "ERROR: Value has to be greater than 0. ";
  65.  cin >> People;
  66.  } 
  67.  Town.setPopulation(People); 
  68.  
  69.  cout << "Enter annual number of births: ";
  70.  cin >> Births;
  71.  while (Births < 0)
  72.  { cout << "ERROR: Value cannot be negative. ";
  73.  cin >> Births;
  74.  } 
  75.  Town.setBirths(Births); 
  76.  
  77.  cout << "Enter annual number of deaths: ";
  78.  cin >> Deaths;
  79.  while (Deaths < 0)
  80.  { cout << "ERROR: Value cannot be negative. ";
  81.  cin >> Deaths;
  82.  } 
  83.  Town.setDeaths(Deaths);
  84.  
  85.  cout << "\nPopulation Statistics "; 
  86.  cout << fixed << showpoint << setprecision(3);
  87.  cout << "\n\tPopulation: " << setw(7) << Town.getPopulation();
  88.  cout << "\n\tBirth Rate: " << setw(7) << Town.getBirthRate();
  89.  cout << "\n\tDeath Rate: " << setw(7) << Town.getDeathRate() << endl;
  90.  
  91.  return 0;
  92.  }
Success #stdin #stdout 0s 3300KB
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stdout
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Enter total population: Enter annual number of births: Enter annual number of deaths: 
Population Statistics 
	Population:       5
	Birth Rate:   1.200
	Death Rate:   1.400
https://ideone.com/L5y8fl
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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