investment class example

#include <iostream>
#include <iomanip>
#include <math.h>

using namespace std;

//investment class

class investment {
private:  //attributes (almost always private)
    double invAmt;
    double intRate;

public: //methods (allow you to access attributes(private data)
    investment();  //constructor

    investment(double amt, double rate); //constructor
    void setIntRate(double rate);  //setters
    void setInvAmt(double amt);  //setters

    double getIntRate();  //getters
    double getInvAmt();  //getters

    long double futureValue(int years);
};

//constructor definition -- set a starting point for your values.

investment::investment()
{
    invAmt = 0.0;
    intRate = 0.0;
};
investment::investment(double amt, double rate)
{
    invAmt = amt;
    intRate = rate;
};

void investment::setIntRate(double rate)
{
    intRate = rate;
};

double investment::getIntRate()
{
    return intRate;
};


void investment::setInvAmt(double amt)
{
    invAmt = amt;
};

double investment::getInvAmt()
{
    return invAmt;
};

long double investment::futureValue(int years)
{
    return (invAmt*pow((1 + intRate), years));  //using 'pow' includes math header.
};


int main()
{
    int years = 0;
    double rate;
    double amt;
    char answer;

    cout << "Would you like to use the Investment Program?(Y/N) \n";
    cin >> answer;

    while (answer == 'y' || answer == 'Y') {


        cout << "Please input your interest rate, amount, and number of years: \n";
        cout << "Interest Rate (in percent): \n";
        cin >> rate;
        cout << "Investment Amount: \n";
        cin >> amt;
        cout << "Number of years invested: \n";
        cin >> years;


        investment myInvestment(amt, rate);
        myInvestment.setIntRate(rate / 100);
        myInvestment.setInvAmt(amt);

        cout << "Your investment: " << myInvestment.futureValue(years);
        cout << endl;

        cout << "Your interest rate: " << myInvestment.getIntRate();

        cout << endl;
        cout << endl;

        cout << "Would you like to use the Investment Program?(Y/N) \n";
        cin >> answer;

        if (answer == 'n' || answer == 'N')
        {
            cout << "Thank you and have a nice day!";
        }

    }
    return 0;
};