\ CS 238 Exploration 2

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Hey guys… Here’s my code so far. Let me know if you have any questions about it.

Display Results

Displays all the numbers in the proper format

void Amortize::displayResults() {
cout << endl <<
      "##############################################" << endl << endl;

   cout.precision(2);
   cout << setiosflags(ios::fixed) <<
      "      Principal: " << mPrincipal << endl <<
      "           Term: " << mTermInMonths << " months" << endl;

   cout.precision(3);
   cout <<
      "     Annual Rate " << mRate << "%" << endl;

   cout.precision(7);
   cout <<
      "   Periodic Rate " << mPeriodicRate << endl << endl;

   cout.precision(2);
   cout << setiosflags(ios::fixed) <<

      "Monthly Payment:   " << mMonthlyPayment << endl <<
      "  Extra Payment:   " << mExtraMonthlyPayment << endl << endl;

   cout << "   Reduced Term: "
         << reducedTerm << " months (shorter by "
         << shorterBy << " month(s) = " << (int)(shorterBy/12)
         << " year(s) " << shorterBy - ((int)(shorterBy/12) * 12)
         << " month(s))" << endl;

   cout << setiosflags(ios::fixed) <<

      " Total Payments: " << totalPayments << endl <<
      " Extra Payments:   " << extraPayments << endl <<
      " Total Interest:   " << totalInterest << endl <<
      "  Total Savings:   " << totalSavings << endl <<
      "  Intrst/Prncpl:   " << interest << "%" << endl;
}

Find Monthly Payments

Um… finds the monthly payments…

/**
* c = (rP)/(1-(1+r)^-n)
* r = monthly rate
* P = principal
* n = term (monthly payments)
*/
void Amortize::findMonthlyPayment()
{
   mMonthlyPayment = (mPeriodicRate * mPrincipal)
                     / (1 - pow((1 + mPeriodicRate), -mTermInMonths));
}

Zero to Bool

A subtle wrapper that converts a string (if the string can be coerced into an int) to bool

bool Amortize::zeroToBool(int val)
{
   return val != 0;
}

Find Periodic Rate

Breaks the APR into the monthly rate

void Amortize::findPeriodicRate()
{
   // returns true if mRate is not zero
   if (zeroToBool(mRate))
   {
      mPeriodicRate = mRate / 1200;
      mHavePeriodicRate = true;
   }
}

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