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  1. //Maxwell Brewer            CS1A           Chapter 3, P. 147, #17
  2. //
  3. /***************************************************************
  4.  * 
  5.  * CALCULATE MONTHLY PAYMENTS
  6.  * _____________________________________________________________
  7.  * 
  8.  * This program will prompt the user for for the loan amount,
  9.  * annual interest rate, and the number of payments.
  10.  * _____________________________________________
  11.  * INPUT
  12.  * 
  13.  * Loan amount, annual interest rate, number of payments
  14.  * 
  15.  * OUTPUT
  16.  * 
  17.  * monthly payment, interest rate, total cost
  18.  * 
  19.  ***************************************************************/
  20.  
  21. #include <iostream>
  22. #include <iomanip>
  23. #include <cmath>
  24. #include <string>
  25.  
  26. using namespace std;
  27.  
  28. int main() {
  29.  
  30.   // Initialization
  31.  
  32.   double loanAmt;
  33.   double monthlyInt;
  34.   double monthlyPay;
  35.   double totalPay;
  36.   double intPaid;
  37.   double annualInt;
  38.  
  39.   int    numPay;
  40.  
  41.     // Display input prompts
  42.  
  43.     cout << "Enter the loan amount: \n";
  44.     cin  >> loanAmt;
  45.  
  46.     cout << "Enter the annual interest rate as percent: \n";
  47.     cin  >> annualInt;
  48.  
  49.     cout << "Enter number of payments: \n";
  50.     cin  >> numPay;
  51.  
  52.     monthlyInt = annualInt/(12*100);
  53.  
  54.     monthlyPay = (monthlyInt * pow((1+monthlyInt), 
  55.                   numPay)) / ((pow((1+monthlyInt), 
  56.                   numPay) - 1)) * loanAmt;
  57.  
  58.     totalPay = numPay * monthlyPay;  
  59.  
  60.     intPaid = totalPay - loanAmt;
  61.  
  62.     // Output
  63.  
  64.     cout << fixed << setprecision(2) << endl;
  65.  
  66.     cout.width(10);
  67.  
  68.     cout << "Loan Amount: $"            << loanAmt    << endl;
  69.     cout << "Monthly Interest Rate: "   << monthlyInt << endl;
  70.     cout << "Number of Payments: "      << numPay     << endl;
  71.     cout << "Monthly Payment: $"        << monthlyPay << endl;
  72.     cout << "Amount Paid Back: $"       << totalPay   << endl;
  73.     cout << "Interest Paid: $"          << intPaid    << endl;
  74.  
  75. 	return 0;
  76. }
Success #stdin #stdout 0s 5284KB
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stdin
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200000
3
36
stdout
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Enter the loan amount: 
Enter the annual interest rate as percent: 
Enter number of payments: 

Loan Amount: $200000.00
Monthly Interest Rate: 0.00
Number of Payments: 36
Monthly Payment: $5816.24
Amount Paid Back: $209384.71
Interest Paid: $9384.71
https://ideone.com/O90Pmj
Chapter 3, P. 147, #17
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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