Question

/* Homework Lab 4

- Using manipulators to format output
*/

//*****************************************************************
// Mortgage Payment Calculator program
// This program determines the monthly payments on a mortgage given
// the loan amount, the yearly interest, and the number of years.
//*****************************************************************

#include <iostream> // Access cout
#include <cmath> // Access power function
#include <iomanip> // Access manipulators
using namespace std;

const float LOAN_AMOUNT = 50000.00; // Amount of the loan
const float YEARLY_INTEREST = 0.0524; // Yearly interest rate
const int NUMBER_OF_YEARS = 7; // Number of years

int main()
{
   // local variables
   float monthlyInterest; // Monthly interest rate
   int numberOfPayments; // Total number of payments
   float monthlyPayment; // Monthly payment

   // Calculate values
   monthlyInterest = YEARLY_INTEREST / 12;
   numberOfPayments = NUMBER_OF_YEARS * 12;
   monthlyPayment = (LOAN_AMOUNT * pow(monthlyInterest + 1, numberOfPayments)
       * monthlyInterest)
       / (pow(monthlyInterest + 1, numberOfPayments) - 1);

   // Code to produce the Original Program Output

   cout << "---------------- Original program output -----------------" << endl << endl;

   cout << fixed << setprecision(2) << "For a loan amount of "
       << LOAN_AMOUNT << ", an interest rate of " << YEARLY_INTEREST << "," << endl
       << "and " << NUMBER_OF_YEARS << " year mortgage, your monthly payments are $"
       << monthlyPayment << "." << endl << endl;

   /* TODO: Step 1

   Write additional code to produce the output results shown
   in Step 1 Output below to right justify all values.
   Set the floating point format just once using the fixed, showpoint,
   and setprecision() manipulators. Use the setw() manipulator
   repeatedly on each line (once for each of the two columns)
   of output to adjust the column widths.

   NOTE: You are NOT allowed to add blank spaces to the beginning
   or end of strings to make them line up properly. You MUST use
   'setw' properly to achieve the defined results.

   ALSO, make sure you use the defined constants and variables in
   your output statements - DO NOT "hard code" the numeric values
   within the cout statements.
   */

   cout << "----------------- Program Output Step 1 ------------------" << endl << endl;

   // <Step 1 code here>

   /* TODO: Step 2

   Write additional code to produce the output results shown
   in Program Output Step 2 below to add 4-digit precision
   to interest rate (while also keeping Interest Rate and Monthly
   Payments as 2 digits), and line up all numeric values by their
   decimal points. Use setprecision() more than once and adjust
   field width (via setw) as necessary.

   NOTE: You are NOT allowed to add blank spaces to the beginning
   or end of strings to make them line up properly. You MUST use
   'setw' properly to achieve the defined column results.
   */
  
   cout << "----------------- Program Output Step 2 ------------------" << endl << endl;

   // <Step 2 code here>
  

   return 0;
}

/*

---------------- Original program output -----------------

For a loan amount of 50000.00, an interest rate of 0.05,
and 7 year mortgage, your monthly payments are $712.35.

----------------- Program Output Step 1 ------------------

Loan Amount: 50000.00
Interest Rate: 0.05
Years: 7

Monthly Payments: 712.35

----------------- Program Output Step 2 ------------------

Loan Amount: 50000.00
Interest Rate: 0.0524
Years: 7

Monthly Payments: 712.35

Press any key to continue . . .

*/

Answer 1

Program

/* Homework Lab 4
- Using manipulators to format output
*/

//*****************************************************************
// Mortgage Payment Calculator program
// This program determines the monthly payments on a mortgage given
// the loan amount, the yearly interest, and the number of years.
//*****************************************************************

#include <iostream> // Access cout
#include <cmath> // Access power function
#include <iomanip> // Access manipulators
using namespace std;

const float LOAN_AMOUNT = 50000.00; // Amount of the loan
const float YEARLY_INTEREST = 0.0524; // Yearly interest rate
const int NUMBER_OF_YEARS = 7; // Number of years

int main()
{
// local variables
float monthlyInterest; // Monthly interest rate
int numberOfPayments; // Total number of payments
float monthlyPayment; // Monthly payment

// Calculate values
monthlyInterest = YEARLY_INTEREST / 12;
numberOfPayments = NUMBER_OF_YEARS * 12;
monthlyPayment = (LOAN_AMOUNT * pow(monthlyInterest + 1, numberOfPayments)
* monthlyInterest)
/ (pow(monthlyInterest + 1, numberOfPayments) - 1);

// Code to produce the Original Program Output

cout << "---------------- Original program output -----------------" << endl << endl;

cout << fixed << setprecision(2) << "For a loan amount of "
<< LOAN_AMOUNT << ", an interest rate of " << YEARLY_INTEREST << "," << endl
<< "and " << NUMBER_OF_YEARS << " year mortgage, your monthly payments are $"
<< monthlyPayment << "." << endl << endl;

/* TODO: Step 1

Write additional code to produce the output results shown
in Step 1 Output below to right justify all values.
Set the floating point format just once using the fixed, showpoint,
and setprecision() manipulators. Use the setw() manipulator
repeatedly on each line (once for each of the two columns)
of output to adjust the column widths.
  
NOTE: You are NOT allowed to add blank spaces to the beginning
or end of strings to make them line up properly. You MUST use
'setw' properly to achieve the defined results.
  
ALSO, make sure you use the defined constants and variables in
your output statements - DO NOT "hard code" the numeric values
within the cout statements.

*/
  
cout << "----------------- Program Output Step 1 ------------------" << endl << endl;

// <Step 1 code here>

cout << left << setw(20) << "Loan Amount: " << fixed << setprecision(2) << right << setw(10) << LOAN_AMOUNT << endl
<< left << setw(20) << "Interest Rate: " << setprecision(2) << right << setw(10) << YEARLY_INTEREST << endl
<< left << setw(20) << "Years: " << right << setw(7) << NUMBER_OF_YEARS << endl
<< left << setw(20) << "Monthly Payment: " << setprecision(2) << right << setw(10) << monthlyPayment << endl << endl;

/* TODO: Step 2

Write additional code to produce the output results shown
in Program Output Step 2 below to add 4-digit precision
to interest rate (while also keeping Interest Rate and Monthly
Payments as 2 digits), and line up all numeric values by their
decimal points. Use setprecision() more than once and adjust
field width (via setw) as necessary.
  
NOTE: You are NOT allowed to add blank spaces to the beginning
or end of strings to make them line up properly. You MUST use
'setw' properly to achieve the defined column results.

*/
  
cout << "----------------- Program Output Step 2 ------------------" << endl << endl;

// <Step 2 code here>
  
cout << left << setw(20) << "Loan Amount: " << fixed << setprecision(2) << right << setw(10) << LOAN_AMOUNT << endl
<< left << setw(20) << "Interest Rate: " << setprecision(4) << right << setw(12) << YEARLY_INTEREST << endl
<< left << setw(20) << "Years: " << right << setw(7) << NUMBER_OF_YEARS << endl
<< left << setw(20) << "Monthly Payment: " << setprecision(2) << right << setw(10) << monthlyPayment << endl;
  
cout << "Press any key to continue . . ." << endl;

return 0;
}

Sample Output: