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

ID: 3696098 • 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.

Explanation / Answer

#include "Population.h"
#include <iomanip>

using namespace std;

void printTitle();

int main(){
double bith = 5, death = 5, population = 5, bRate, dRate;
Population pop, ipop(bith, death, population);

printTitle();

   cout << fixed << setprecision(5);
   cout << " pop birth rate: " << pop.getBirthRate();
   cout << " pop death rate: " << pop.getDeathRate();

cout << " ipop birth rate: " << ipop.getBirthRate();
cout << " ipop death rate: " << ipop.getDeathRate();

   ipop.setDeaths(800);
   ipop.setBirths(100);
   ipop.setPopulation(5);

cout << " ipop birth rate: " << ipop.getBirthRate();
cout << " ipop death rate: " << ipop.getDeathRate();

return 0;
}

void printTitle(){

   cout << " **************";
   cout << " Population   |";
   cout << " **************";

}

Population.h
#ifndef POPULATION_H
#define POPULATION_H

#include <iostream>

using namespace std;

class Population{

private:
int population, births, deaths;

public:
Population();
Population(int, int, int);

   void setPopulation(int);
   void setBirths(int);
   void setDeaths(int);
   double getDeathRate();
   double getBirthRate();

};

#endif

Population.cpp
#include "Population.h"

using namespace std;

Population::Population(){

   births = 5;
   deaths = 5;
   population = 5;

}

Population::Population(int b, int d, int p){

   if(p < 2)p = 2;
   if(b < 0)b = 0;
   if(d < 0)d = 0;
   births = b;
   deaths = d;
   population = p;

}

void Population::setPopulation(int p){
if(p < 2)p = 2;
population = p;
}

void Population::setBirths(int b){
if(b < 0)b = 0;
births = b;
}

void Population::setDeaths(int d){
if(d < 0)d = 0;
deaths = d;
}

double Population::getDeathRate(){
double dRate = deaths / population;
return dRate;
}

double Population::getBirthRate(){
double bRate = births / population;
return bRate;
}

sample output

**************
Population   |
**************

pop birth rate: 1.00000
pop death rate: 1.00000

ipop birth rate: 1.00000
ipop death rate: 1.00000

ipop birth rate: 20.00000
ipop death rate: 160.00000sh-4.3$

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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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