last itenration of while loop

Question

im trying to display the last iteration of a while loop outside of the loop itself as in once the while loop executes im trying to grab the last iteration the while loop performed and display it here is a portion of the loop i mean

while (balance > 0)

{

cout << setw(6) << month;

if (balance < monthlyPayment)

{

monthlyPayment = balance;

principal = (monthlyPayment - (balance * interestRatePer));

interestPaid = monthlyPayment - principal;

balance = 0;

}

else

{

principal = monthlyPayment - (balance * interestRatePer);

interestPaid = monthlyPayment - principal;

balance += (balance * interestRatePer);

balance -= monthlyPayment;

}

totalInterest += interestPaid;

cout << fixed << setprecision(2);

cout << left << setw(20) << "" << "$" << right << setw(5) << interestPaid;

cout << left << setw(16) << "" << "$" << right << setw(5) << principal;

cout << left << setw(15) << "" << "$" << right << setw(5) << balance;

cout << endl;

month++;

}

cout << left << "total interest paid: $" << totalInterest;

return 0;

Answer 1

You have a while loop with while(condition) and are interested in fetching the last iteration of the loop and store it in some data to be executed once you exit the loop.

One method is to check the condition after all your processing is done.

last_data = NULL

while (condition) {

do some stuff on the data

if (condition is no longer satisfied) {

store the data onto last_data

}

}

do stuff to last_data

Another option if you need to keep all the data in every iteration is to use some kind of container like a vector and push the data onto that container in every iteration.

To get the result of the last iteration, you fetch the last element of the vector.

This has the additional benefit that you keep the information from every iteration.

The drawback is that it can waste a lot more space.