modified

Chapter-3-Expressions-and-Interactivity/Review Questions and Exercises/Programming Challenges/19.cpp

@@ -4,6 +4,7 @@
 *
 *       The monthly payment on a loan may be calculated by the
 *       following formula:
+
 *       Payment = [Rate * (1 + Rate)^N / ((1 + Rate)^N - 1)] * L
 *
 *       Rate is the monthly interest rate, which is the annual interest
@@ -33,16 +34,16 @@ int main()
     // Constant
     const int ONE     = 1,
               HUNDRED = 100;
-
+    
     // Variables
     int N;
-
+    
     float Rate,
           L,
           Payment,
           amount_paid_back,
           interest_paid;
-
+    
     // Ask the user for Rate, number of paymets, and amount of the loan
     cout << endl;
     cout << "What is interest rate of the loan? %";
@@ -51,18 +52,18 @@ int main()
     cin >> L;
     cout << "Number of payments? ";
     cin >> N;
-
+    
     // Calculation
     Rate /= HUNDRED; // 4.25% == .0425
     // Payment = [Rate * (1 + Rate)^N / ((1 + Rate)^N - 1)] * L
     Payment = ((Rate) * pow(ONE + (Rate), N) / (pow(ONE + (Rate), N) - ONE)) * L;
-
+    
     Rate *= HUNDRED; // .0425 == 4.25
-
+    
     amount_paid_back = N * Payment;
-
+    
     interest_paid    = (N * Payment) - L;
-
+    
     // Display
     /************************************************
      *       Loan Amount:            $ 10000.00     *
@@ -72,30 +73,30 @@ int main()
      *       Amount Paid Back:       $ 11957.15     *
      *       Interest Paid:          $  1957.15     *
      ************************************************/
-
+    
     cout << setprecision(2) << fixed << right << endl;
-
+    
     cout << "Loan Amount:           $";
     cout << setw(10) << L << endl;
-
+    
     cout << "Monthly Interest Rate: ";
     cout << setw(10) << Rate << '%' << endl;
-
+    
     cout << "Number of Payments:     ";
     cout << setw(10) << N     << endl;
-
+    
     cout << "Monthly Payment:       $";
     cout << setw(10) << Payment << endl;
-
+    
     cout << "Amount Paid Back:      $";
-    cout << setw(10) << N * Payment << endl;
-
+    cout << setw(10) << amount_paid_back << endl;
+    
     cout << "Interest Paid:         $";
-    cout << setw(10) << (N * Payment) - L;
-
+    cout << setw(10) << interest_paid;
+    
     cout << endl << endl;
-
-
+    
+    
     // Terminate Program
     return 0;
 }

Chapter-3-Expressions-and-Interactivity/Review Questions and Exercises/Programming Challenges/20.cpp

@@ -30,9 +30,10 @@
 *       place of precision. Use a named constant for pi.
 *
 * 	Jesus Hilario Hernandez
-* 	August 3rd 2018
+* 	Sept 4th 2018
 *
-*********************************************************#include <iostream>
+********************************************************************/
+#include <iostream>
 #include <cmath>    // pow()
 #include <iomanip>
 using namespace std;
@@ -42,32 +43,32 @@ int main()
     // Constants
     const float SLICE_AREA_SIZE = 14.125,
                 PI         = 3.14159;
-
+    
     const int TWO = 2;
-
+    
     // Variables
     float d,    // Diameter
           r,    // Radius
           Area,
           num_of_slices;
-
+    
     // Ask the user for the diameter of the pizza in inches.
     cout << endl;
     cout << "What is the diameter of the pizza in inches? ";
     cin >> d;
-
+    
     // Calculate the # of slices that may be taken from a pizza
     // of that size
     r = d / TWO;    // Radius
     Area = PI * pow(r, TWO);
     num_of_slices = Area / SLICE_AREA_SIZE;
-
+    
     // Display a message telling the number of slices.
     cout << setprecision(1) << fixed;
     cout << "Number of slices = ";
     cout << num_of_slices << endl;
     cout << endl;
-
+    
     // Terminate Program
     return 0;
 }