Answer to Question #322990 in C++ for Kirito

Question

Your task is to implement this:

• A member variable that will hold the annual interest rate of the loan. Its default value will be 2.5.

• A member variable that will hold the number of years for the loan. Its default value will be 1.

• A member variable that will hold the loan amount. Its default variable will be 1000.

• A default constructor.

• Another constructor that has interest rate, years, and loan amount as its parameters.

• A member function that returns the annual interest rate of this loan.

• A member function that returns the number of the years of this loan.

• A member function that returns the amount of this loan.

• A member function that returns the monthly payment of this loan.

• A member function that returns the total payment of this loan.

Enter yearly interest rate, for example 8.25: 10

Enter number of years as an integer, for example 5: 5

Enter loan amount, for example 120000.95: 300000

The monthly payment is 6374.11

The total payment is 382446.80

Answer 1

#include <cmath>
#include <iostream>
#include <iomanip>
using namespace std;


class Loan {
    double interest;
    int years;
    double amount;


public:
    Loan();
    Loan(double interest, int years, double amount);
    double getInterest();
    int getYears();
    double getAmount();
    double getMonthlyPayment();
    double getTotalPayment();
};


Loan::Loan()
{
    interest = 2.5;
    years = 1;
    amount = 1000;
}


Loan::Loan(double interest, int years, double amount)
{
    this->interest = interest;
    this->years = years;
    this->amount = amount;
}


double Loan::getInterest()
{
    return interest;
}


int Loan::getYears()
{
    return years;
}


double Loan::getAmount() {
    return amount;
}


double Loan::getMonthlyPayment() {
    int n = years*12;
    double r = interest * 0.01 / 12;
    double payment = amount;
    payment /= pow(1+r, n) - 1;
    payment *= r * pow(1+r, n);
    return payment;
}


double Loan::getTotalPayment() {
    double total = getMonthlyPayment();
    total *= years*12;


    return total;
}


int main() {
    double interest, amount;
    int years;
    
    cout << "Enter yearly interest rate, for example 8.25: ";
    cin >> interest;
    cout << "Enter number of years as an integer, for example 5: ";
    cin >> years;
    cout << "Enter loan amount, for example 120000.95: ";
    cin >> amount;


    Loan loan(interest, years, amount);
    double monthly = loan.getMonthlyPayment();
    double total = loan.getTotalPayment();
    
    cout << fixed << setprecision(2);
    cout << "The monthly payment is " << monthly << endl;
    cout << "The total payment is " << total << endl;


    return 0;
}