Question

Write a program that will predict the size of a population of organisms.
The program should ask the user for the starting number of organisms, their average daily population increase (as a percentage), and the number of days they will multiply.
A loop should display the size of the population for each day.
Input Validation:
Do not accept a number less than 2 for the starting size of the population. "The starting number of organisms must be at least 2."
Do not accept a negative number for average daily population increase. "The average daily population increase must be a positive value."
Do not accept a number less than 1 for the number of days they will multiply. "The number of days must be at least 1."

Using the following test data:
-1, 1, 3, 25, 12

Your output should look like this:
Enter the starting number of organisms: The starting number of organisms must be at least 2.
Enter the starting number of organisms: The starting number of organisms must be at least 2.

Enter the starting number of organisms: Enter the average daily population increase (as a percentage):

Enter the number of days they will multiply:

On day 1 the population size was 4.
On day 2 the population size was 5.
On day 3 the population size was 6.
On day 4 the population size was 7.
On day 5 the population size was 9.
On day 6 the population size was 11.
On day 7 the population size was 14.
On day 8 the population size was 18.
On day 9 the population size was 22.
On day 10 the population size was 28.
On day 11 the population size was 35.
On day 12 the population size was 44.

This is C++ and let code can be works on visual studio 2017 please.

Use blank lines to separate the major parts of your main function. And show your output.

Answer 1

Plzzzzzzzzzzzzzzzzzzzzz Upvote...
Comment for any queries..


Visual C++ Copyable Code :

#include <iostream>
using namespace std;

int main()
{
   int Days, SizeOfPop;
   double DailyIncrease;
   cout << "Enter the starting number of organisms: (The starting number of organisms must be at least 2.) : ";
   cin >> SizeOfPop;
   cout << "Enter the average daily population increase (as a percentage): ";
   cin >> DailyIncrease;
   cout << "Enter the number of days they will multiply: ";
   cin >> Days;


   while (SizeOfPop < 2 || DailyIncrease < 0 || Days < 1)
   {
       if (SizeOfPop < 2)
       {
           cout << "Error!\nStarting size of population " << "must be greater than 2.\n";
           cout << "What is the starting number of organisms? ";
           cin >> SizeOfPop;
       }
       else if (DailyIncrease < 0)
       {
           cout << "Error!\nAverage daily population " << "increase must be greater than 0.\n";
           cout << "What is the average daily population increase? \n" << "(as a percentage of current population)? ";
           cin >> DailyIncrease;
       }
       else if (Days < 1)
       {
           cout << "Error!\nNumber of days must be greater than 0.\n-5";
           cout << "Enter the number of days of growth: ";
           cin >> Days;
       }
   }


//Logic for calculating the increase in population
   for (int X = 1; X <= Days; X++)
   {
       SizeOfPop = SizeOfPop + (DailyIncrease*SizeOfPop);
       cout << "On day " << X << " the population size was " << SizeOfPop << endl;
   }


   system("pause");
   return 0;
}



Sample Output in Visual Studio 2017 :



Enter the starting number of organisms: (The starting number of organisms must be at least 2.) : 2 Enter the average daily population increase (as a percentage): 2 Enter the number of days they will multiply: 5 On day 1 the population size was 6 On day 2 the population size was 18 On day 3 the population size was 54 On day 4 the population size was 162 On day 5 the population size was 486 Press any key to continue . . . _



Enter the starting number of organisms: (The starting number of organisms must be at least 2.) : 1 Enter the average daily population increase (as a percentage): 1 Enter the number of days they will multiply: 1 Error! Starting size of population must be greater than 2. What is the starting number of organisms? _