In a population, the birth rate and death rate are calculated as follows: Birth

ID: 3779879 • Letter: I

Question

In a population, the birth rate and death rate are calculated as follows:

Birth Rate = Number of Births ÷ Population

Death Rate = Number of Deaths ÷ Population

For example, in a population of 100,000 that has 8,000 births and 6,000 deaths per year, the birth rate and death rate are:

Birth Rate = 8,000 ÷ 100,000 = 0.08

Death Rate = 6,000 ÷ 100,000 = 0.06

Design a Population class that stores a population, number of births, and number of deaths for a period of time. Member functions should return the birth rate and death rate. Implement the class in a program. Input Validation: Do not accept population figures less than 1, or birth or death numbers less than 0. (C++)

Explanation / Answer

#include<iostream>
using namespace std;

class Population
{
   long population;
   long no_births;
   long no_deaths;
public:
   //constructor to initialize private members to zero
   Population()
   {

       population = 0;
       no_births = 0;
       no_deaths = 0;
   }
   //method to set values of an object of type Population
   void set_population(long pol, long births, long deaths)
   {
       population = pol;
       no_births = births;
       no_deaths = deaths;
   }
   //method to calculate birth rate
   double birth_rate()
   {
       double rate =((double)no_births/population)*100;
       return rate;
   }
   //method to calculate death rate
   double death_rate()
   {
       double rate = ((double)no_deaths/population)*100;
       return rate;
   }

};

int main()
{
   //declare an object of type population
   Population obj;
   //local variable to store values entered from user
   long polulation,births,deaths;

   cout<"Enter values for population, number of births , number of deaths ";
   cout<<"Population = ";
   cin>>polulation;

cout<<"births = ";
cin>>births;

cout<<"deaths = ";
cin>>deaths;

//set above values for an object pol
obj.set_population(polulation,births,deaths);

   cout<<"Birth rate = "<<obj.birth_rate()<<"%"<<endl;
   cout<<"Death rate = "<<obj.death_rate()<<"%"<<endl;

}

------------------------------------------------------------------------

output

Population = 200000
births = 12344
deaths = 8970
Birth rate = 6.172%
Death rate = 4.485%

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In a population, the birth rate and death rate are calculated as follows: Birth

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In a population, the birth rate and death rate are calculated as follows: Birth

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