// BlankConsoleLab.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <iomanip>
#include <string>
#include <cmath> //need this to use the pow math

using namespace std;

using std::cout;
using std::cin;
using std::endl;

float far;
float cel;
float mph;
float newFar;
float chill;

//The following const are for the while loops to control what user can enter
const int celmin = -62;
const float celmax = 49.5;
const int farmin = -80;
const int farmax = 121;
const int mphmin = 0;
const int mphmax = 231;

//to check for user to enter celcius or fahrenheit
string check;
const string celcheck = "c";

float celtofar(float cel);
float getParam(float& far, float& mph);
float windchill(float far, float mph);
float getMPH(float& mph);

int main() // calls functions and then displays the fahrenheit and windchill at the end

{
    far = 0.0;
    cel = 0.0;
    mph = 0.0;

    cout << "Do you want to enter fahrenheit or celcius? Enter f or c" << endl;
    cin >> check;

    if (check == celcheck)
    {
        celtofar(cel);
        far = newFar;
        getMPH(mph);
    }
    else
        getParam(far, mph);

    windchill(far, mph);

    cout << "You entered " << far << "F" << endl;
    cout << "For " << far << " degrees F and " << mph << " MPH wind speed, the windchill is: " << chill;

    return 0;
}

float getParam(float& far, float& mph) //gets fahrenheit and wind speed from user
{
    cout << "Please enter your fahrenheit temp:" << endl;
    cout << "Must be between " << farmin << " and " << farmax << endl;
    cin >> far;
    while (far < farmin || far > farmax)
    {
        cout << "Please enter your fahrenheit temp:" << endl;
        cout << "Must be between " << farmin << " and " << farmax << endl;
        cin >> far;
    }
    cout << "Please enter your wind speed in mph:" << endl;
    cout << "Must be between " << mphmin << " and " << mphmax << endl;
    cin >> mph;
    while (mph < mphmin || mph > mphmax)
    {
        cout << "Please enter your wind speed in mph:" << endl;
        cout << "Must be between " << mphmin << " and " << mphmax << endl;
        cin >> mph;
    }
    return far, mph;
}

float celtofar(float cel) //calculates celcius to fahrenheit and returns the value
{
    cout << "Please enter your celcius temp:" << endl;
    cout << "Must be between " << celmin << " and " << celmax << endl;
    cin >> cel;
    while (cel < celmin || cel > celmax)
    {
        cout << "Please enter your celcius temp:" << endl;
        cout << "Must be between " << celmin << " and " << celmax << endl;
        cin >> cel;
    }
    newFar = (9 / 5) * cel + 32;
    return newFar;
}

float windchill(float far, float mph) //calculates wind chill and returns it
{
    chill = 35.74 + (.6215 * far) - (35.75 * pow(mph, .16)) + (.4275 * pow(far, .16));
    return chill;
}

float getMPH(float& mph) //gets mph only for when you select celcius function
{
    cout << "Please enter your wind speed in mph:" << endl;
    cout << "Must be between " << mphmin << " and " << mphmax << endl;
    cin >> mph;
    while (mph < mphmin || mph > mphmax)
    {
        cout << "Please enter your wind speed in mph:" << endl;
        cout << "Must be between " << mphmin << " and " << mphmax << endl;
        cin >> mph;
    }
    return mph;
}