#include <fstream>
#include <iostream>
#include <string>
#include <fstream>
#include <string>
#include <iomanip>

using namespace std;

void getPrice();
void getDownPayment();
void getTradeIn();
void getInterestRate();
void calcMonPayment();

int main()
{
    //Function Calls
    getPrice();
    getDownPayment();
    getTradeIn();
    getInterestRate();
    calcMonPayment();

    cin.get();
}

void getPrice()
{
    float price;

    cout << "Please enter the price of the vehicle: " << endl;
    cin >> price;
    cout << fixed << setprecision(2) <<price << endl;

    cin.get();
}

void getDownPayment()
{
    float downPayment;

    cout << "Please enter the down payment: " << endl;
    cin >> downPayment;
    cout << fixed << setprecision(2) << downPayment << endl;

    cin.get();
}

void getTradeIn()
{
    float tradeIn;

    cout << "Please enter the trade in value of the vehicle: " << endl;
    cin >> tradeIn;
    cout << fixed << setprecision(2) << tradeIn << endl;

    cin.get();
}

void getInterestRate()
{
    float interestRate;

    cout << "Please enter the interest rate: " << endl;
    cin >> interestRate;
    cout << fixed << setprecision(2) << interestRate << endl;

    cin.get();
}

void calcMonPayment()
{
    float price;
    float downPayment;
    float tradeIn;
    float interestRate;
    float loanAmt;
    float annualIntRate;
    float annualIntPercent;
    float monIntRate;
    int noMonths;
    float monPayment;
    
    annualIntRate = interestRate;
    monIntRate = (annualIntRate/12.0);
    annualIntPercent = (annualIntRate*100.0);
    loanAmt = (price - downPayment-tradeIn);
    monPayment = (loanAmt*monIntRate)/(1.0-(1+monIntRate)-noMonths)

    cout << "The monthly payment of the vehicle is: " << monPayment << endl;
    
}

(1.0-(1+monIntRate)-noMonths)

price = getprice(); //this will require you to have your functions return something and cannot be void
turnIn = tradeIn();

//.....

finalFunction(price, turnIn, etc...)

float getPrice();
float calcMonPayment(float price, float downPayment, float tradeIn, float interestRate);

int main()
{
    // main's variables
    float price; // this is the main price which is not the same one in getPrice
    float downPayment;
    float tradeIn;
    float interestRate;
    float monPayment;
    
    //Function Calls
    float price = getPrice();
    getDownPayment();
    getTradeIn();
    getInterestRate();
    monPayment = calcMonPayment( price, downPayment, tradeIn, interestRate);
    cout << "The monthly payment of the vehicle is: " << monPayment << endl;

    cin.get();
}

float getPrice()
{
    float price;

    cout << "Please enter the price of the vehicle: " << endl;
    cin >> price;
    cout << fixed << setprecision(2) <<price << endl;

    cin.get();
    return(price); // you have to return the price
}

float calcMonPayment(float price, float downPayment, float tradeIn, float interestRate)
{
    //float price; // these are passed in, not declared here
    //float downPayment;
    //float tradeIn;
    //float interestRate;
    float loanAmt;
    float annualIntRate;
    float annualIntPercent;
    float monIntRate;
    int noMonths;
    float monPayment;
    
    annualIntRate = interestRate;
    monIntRate = (annualIntRate/12.0);
    annualIntPercent = (annualIntRate*100.0);
    loanAmt = (price - downPayment-tradeIn);
    monPayment = (loanAmt*monIntRate)/(1.0-(1+monIntRate)-noMonths)

    // this line should be in main
    //cout << "The monthly payment of the vehicle is: " << monPayment << endl;
    
    return(monPayment);
    
}

(1.0-(1+monIntRate)-noMonths)

(1.0-(1+monIntRate)*pow(-, noMonths))

(1.0-(1+monInRate)*pow(noMonths, -))

void calcMonPayment(float price, float tradeIn, float downPayment, float annualIntRate)
{
    float loanAmt;
    float annualIntPercent;
    float monIntRate;
    int noMonths;
    float monPayment;


    noMonths = 24;

    monIntRate = (annualIntRate/12.0);
    annualIntPercent = (annualIntRate*100.0);
    loanAmt = (price - downPayment - tradeIn);
    monPayment = (loanAmt*monIntRate)/(1-pow(1+monIntRate,-noMonths));

    cout << fixed << setprecision(2) << "The monthly payment is " << monPayment << endl;
    cin.get();
    
}