This is the code that I have: THE PROBLEM that I\'m having is DURING the while l

Question

This is the code that I have:

THE PROBLEM that I'm having is DURING the while loop, if I press -99 it still continues the loop.

If I enter -99 at the very beginning, it works and says good bye, but let's say i put in numbers like $600 and 5 years, the calculator works, and then I want to exit and I enter -99, it still continues the loop.

int main()
{
    cout.setf(ios::fixed);
    cout.setf(ios::showpoint);
    cout.precision(3);


    // Welcome User
    cout << " " << endl;
    cout << "Welcome to calculation of the asset depreciation costs"

            << endl;
    cout << "------------------------------------------------------"
           << endl;
    cout << " " << endl;

// Ask user for information about amount and # of years
    double amount; // Initial cost of the asset
    cout << "Enter cost of the asset or -99 to end the program: ";
    cin  >> amount;


    // Execute program unless user enters -99 to exit
    while(amount != -99)
    {

          int numYears; // Number of years to use calculator
          cout << "Enter the expected life time of the asset: ";
          cin  >> numYears;
          cout << " " << endl;


          // Call the straight line and sum of years methods
          straightLine(amount, numYears);
          sumOfYears(amount, numYears);

    }

    cout << "Good bye!" << endl;



    return 0;

}

and these are my straightLine and sumOfYears functions

// Straight Line Method
void straightLine(double amount, int numYears)
{  
   // The method for straight line
   double depreciation = amount /  numYears;  

   // Sets up chart when called upon
   cout << " Year   -   Straight - Line Depreciation"
        << " --------------------------------------- ";
   cout << fixed << showpoint << right << setprecision(3);

   // For loop for numbers entered and sets up in the chart
   for(int year = 1; year <= numYears; year++)
      cout << setw(3) << year << setw(25) << depreciation << endl;
}

void sumOfYears(double amount, int numYears)
{

   // Sets up chart for method when called upon
   cout << " Year   -    Sum Of Years Depreciation"
        << " ---------------------------------------" << endl;

   // Adds up numbers from 1 to number entered
   double yearSum = (numYears / 2) + (1 + numYears);

   double depreciation;
   cout << fixed << showpoint << right << setprecision(3);

   // For loop for sum method and sets up chart
   for(int year = 1; year <= numYears;  year++)
   {
      depreciation = (numYears - year +1) * amount / yearSum;
      cout << setw(3) << year << setw(25) << depreciation << endl;
   }

}

Is it something to do with the way that I wrote the straight line and sum of years methods?

Please heeelp!!!!

Explanation / Answer

I think what happened is that you didn't read into amount again, so once you've set your value, it continues to compare the initial value to -99. I do this ALL the time im while loops. Just include a statement towards the end of the stuff in your while loop to make sure you write a new value to amount.

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