Question

Dylan has grandparents who believe in "planning for the future" instead of giving toys for birthdays and Christmas. Each year from the time Dylan is one year old, the grandparents deposit $10 for each year of his age for both his birthday and Christmas ($10 for each the first year, $20 for each the second year, etc.). Not taking interest into account, how much money will be in Dylan's account at the end of the year in which he turns 21?

(For this problem, it's ok to assume that Dylan's birthday comes before Christmas.)

Write a program for the above scenario that uses a for loop to calculate the answer.

Write a program for the above scenario that uses a while loop to calculate the answer.

Write a program for the above scenario that uses a do...while loop to calculate the answer.

Answer 1

Code

Using for loop

#include<iostream>
using namespace std;

int main()
{
   int i, amount=0;

   //using for loop

   for (int i = 1; i <= 21; i++)
   {
       amount += (i * 10);
   }
   cout << "Using for loop" << endl;
   cout << "Dylan's account at the end of the 21 year: $" << amount << endl;

  

   system("pause");
   return 0;
}

output

using while loop

- x I C:\Users\josee\source\repos\Dylan's account after 21 year Debug\Dylan's account after 21 year.exe Using for loop Dylan's account at the end of the 21 year: $2310 Press any key to continue ....

#include<iostream>
using namespace std;

int main()
{
   int i, amount = 0;
   //using while loop
   i = 1; amount = 0;
   while (i <= 21)
   {
       amount += (i * 10);
       i++;
   }

   cout << "\n\nUsing while loop" << endl;
   cout << "Dylan's account at the end of the 21 year: $" << amount << endl;

   system("pause");
   return 0;
}

using fo while

I C:\Users\josee\source\repos\Dylan's account after 21 year Debug\Dylan's account after 21 year.exe - x Using while loop Dylan's account at the end of the 21 year: $2310 Press any key to continue ....

#include<iostream>
using namespace std;

int main()
{
   int i, amount = 0;
  
   i = 1; amount = 0;
  

   //using do while
   do
   {
       amount += (i * 10);
       i++;
   } while (i <= 21);
   cout << "\n\nUsing do while loop" << endl;
   cout << "Dylan's account at the end of the 21 year: $" << amount << endl;
   system("pause");
   return 0;
}

output

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I C:\Users\josee\source\repos\Dylan's account after 21 year Debug\Dylan's account after 21 year.exe - x Using do while loop Dylan's account at the end of the 21 year: $2310 Press any key to continue ....