#include <iostream>

using namespace std;

void controller();
float ctof(float);
float ftoc(float);

int main()
{
    controller();
    return 0;
}

void controller()
{
    char yesno = 'n';
    float temperature[10];

    cout << "Would you like to convert Celsius to Fahrenheit(y/n): ";
    while(yesno != 'y' || yesno != 'n')
    {
        cin >> yesno;
        if(yesno == 'y') { // If yes then convert to fahrenheit
            cout << "Celsius to fahrenheit it is then!\n\n";
            break;
        }
        else if(yesno == 'n') {
            cout << "OK! Fahrenheit to Celsius then.\n\n";
            break;
        }
        else cout << "Invalid input, enter either y or n.";
    }

    for(int i = 0; i < 10; i++)
    {
        cout << "Please enter temperature number " << i+1 << ": ";
        cin >> temperature[i];
    }

    cout << endl << "Now for the conversion..."<< endl;

    for(int i = 0; i < 10; i++)
    {
        float temp;
        if(yesno == 'y')
            temp = ctof(temperature[i]);
        else temp = ftoc(temperature[i]);
        cout << "Temperature " << i+1 << ": " << temp << endl;
    }
}

float ctof(float cels)
{
    return (cels/5)*9+32; // The celsius to fahrenheit formula
}

float ftoc(float fah)
{
    return (fah-32)/9*5; // The fahrenheit to celsius formula
}