In a population, the birth rate is the percentage increase of the population due

Question

In a population, the birth rate is the percentage increase of the population due to births, and the death rate is the percentagedecrease of the population due to deaths. Write a program that asks for the following:

The starting size of a population (minimum 2) (Prompt Enter starting size: )

The annual birth rate (Prompt Enter annual birth rate: )

The annual death rate (Prompt Enter annual death rate: )

The number of years to display (minimum 1) (Prompt Enter years to display: )

The program should then display the starting population and the projected population at the end of each year. It should use a function that calculates and returns the projected new size of the population after a year. The formula is

      N = P(1 + B)(1 - D)

where N is the new population size, P is the previous population size, B is the birth rate, and D is the death rate. Annual birth rate and death rate are the typical number of births and deaths in a year per 1000 people, expressed as a decimal. So, for example, if there are normally about 32 births and 26 deaths per 1000 people in a given population, the birth rate would be .032 and the death rate would be .026.

USING C++

Explanation / Answer

#include
#include

void main()
{
   double n,p,d,b,b1,d1;
   int a,i;

   clrscr();

   cout<<" Enter Starting size:";
   cin>>p;

   cout<<" Enter annual Birth Rate:";
   cin>>b;

   cout<<" Enter annual Death Rate:";
   cin>>d;

   cout<<" Enter Years to Display:";
   cin>>a;

   b1= b/1000;
   d1=d/1000;
   for(i=1;i<=a;i++)
   {
       n=p*(1+b1)*(1-d1);
       cout<<" New Population for "<        p=n+(n-p);
   }
   getch();
}

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