This program is about an imaginary animal called a jackalope. Each generation, t

Question

This program is about an imaginary animal called a jackalope. Each generation, the jackalope population increases by 3% due to births and decreases by 1% due to deaths. Both the number of jackalopes who die and who are born will be rounded down (truncated) to an integer. So using a simple formula for calculating the number of jackalopes after a generation:

If you start with 200 jackalopes, then 3% more are born, increasing the number to 206. 1% of the 206 die, decreasing the number to 204.

If you were to start with 132 jackalopes, then 3 would be born (132 * 0.03 = 3.96, rounded down to 3) and of the 135, 1 would die (135 * 0.01 = 1.35, rounded down to 1), leaving us with 134 jackalopes. The following generation, 3% of the 134 would produce 4 births, and 1% of 138 would produce 1 death, leaving us with 137. Note that this isn't the same result as if we simply add 2% each year.

You should define named constants (using const) for birth and death rates to use in your calculations.

Explanation / Answer

#include<iostream>
using namespace std;
int main()
{
    const int BIRTHRATE=3;
    const int DEATHRATE=1;
    int nb,nd,c=1,ng,jn;
    cout<<"Enter the number of jackalopes: ";
    cin>>jn;
    cout<<"Enter the number of generations for which to be found: ";
    cin>>ng;
    while(ng!=0)
    {
        nb=jn*BIRTHRATE/100;
        nd=jn*DEATHRATE/100;
        jn=jn+nb-nd;
        cout<<" For generation "<<c;
        cout<<" ======================";
        cout<<" Number of births: "<<nb;
        cout<<" Number of deaths: "<<nd;
        cout<<" Total number of population: "<<jn;
        c++;
        ng--;
    }
}

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