#include <stdlib.h>
#include <iostream>
#include <stdio.h>

using namespace std;

int auswahl;
bool eingabe=false;
float cel, fah, kel;

int cif()
{
    cout << "Temperatur in Celsius: ";
    cin >> cel;
    fah=(((cel*9)/5)+32);
    cout << "Temperatur in Fahrenheit: " << fah << endl << endl;
}

int cik()
{
  cout << "Temperatur in Celsius: ";
  cin >> cel;
  kel=cel-273;
  cout << "Temperatur in Kelvin: " << kel << endl << endl;
}

int fic()
{
  cout << "Temperatur in Fahrenheit: ";
  cin >> fah;
  cel=(((fah-32)*5)/9);
  cout << "Temperatur in Celsius: " << cel << endl << endl;
}

int fik()
{
  cout << "Temperatur in Fahrenheit: ";
  cin >> fah;
  kel=((fah+459.67)*5)/9;
  cout << "Temperatur in Kelvin: " << kel << endl << endl;
}

int kif()
{
   cout << "Temperatur in Kelvin: ";
   cin >> kel;
   fah=kel*1.8-459.67;
   cout << "Tmeperatur in Fahrenheit: " << fah << endl << endl;
}

int kic()
{
   cout << "Temperatur in Kelvin: ";
   cin >> kel;
   cel=kel-273.15;
   cout << "Tmeperatur in Celsius: " << cel << endl << endl;
}

int main(int argc, char** argv) {

    while (eingabe==false)
    {
    cout << "Bitte waehlen Sie: " << endl << endl;
    cout << "[1] Celsius in Fahrenheit" << endl;
    cout << "[2] Celsius in Kelvin" << endl;
    cout << "[3] Fahrenheit in Celsius " << endl;
    cout << "[4] Fahrenheit in Kelvin" << endl;
    cout << "[5] Kelvin in Fahrenheit " << endl;
    cout << "[6] Kelvin in Celsius " << endl;
    cout << "[7] Ende" << endl << endl;
    cin >> auswahl;

        switch (auswahl)
        {
            case 1: cif();
                    break;
            case 2: cik();
                    break;
            case 3: fic();
                    break;
            case 4: fik();
                    break;
            case 5: kif();
                    break;
            case 6: kic();
                    break;
            case 7: eingabe=true;
        }
    }

    return (EXIT_SUCCESS);
}