Konwenter_temp PreAlpha

#include <iostream>
#include <stdio.h>
#include <cstdlib>
#include <conio.h>
using namespace std;
/* program do przeliczania konwersji temp.
na podstawie Molivos 2017
Wzory:
Tc = (5/9) * (Tf - 32)
Tf = 32 + (9/5) * Tc
Tk = Tc + 273,15 */
int main()
{
    float cel = 0, k = 0, f = 0, lower, upper;
    f = 32 + (9/5) * cel;
    k = cel + 273.15;
    char option, choose;
    int step;
    // Menu
    for (;;)
    {
        cout << endl;
    cout << "Main Menu" << endl;
    cout << "-----------------" << endl;
    cout << "1. Calculator" << endl;
    cout << "2. Conversion Table" << endl;
    cout << "3. Exit" << endl << endl;
    cout << "Wybierz opcje: " << endl;
    option = getch();
    switch (option)
    {
    case '1':

        for (;;)
        {
            cout << "Choose unit " << endl;
            cout << "1. Celsius " << endl;
            cout << "2. Kelvin " << endl;
            cout << "3. Farenheit " << endl;
            cout << "4. Exit " << endl;
            choose = getch();
            switch (choose)
            {
            case '1':
                  cout << "Imput Celcius: ";
        cin >> cel;
        cout << "Celcius: " << cel;
        cout.width(5);
        k = cel + 273.15;
        cout << "Kelvin: " << k;
        cout.width(5);
        f = 32 + (9/5) * cel;
        cout << "Farenheit: " << f << endl;
        break;

            case '2':
                cout << "Imput Kelvin: ";
                cin >> k;
                cout << "Kelvin: " << k;
                cout.width(5);
                cel = k -273.15;
                cout << "Celcius: " << cel;
                cout.width(5);
                f = 32 + (9/5) * cel;
                cout << "Farenheit: " << f << endl;
                break;
            case '3':
                cout << "Imput Farenheit: ";
                cin >> f;
                cout << "Farenheit: " << f;
                cout.width(5);
                cel = (f - 32) * 5/9;
                cout << "Celcius: " << cel;
                cout.width(5);
                k = cel + 273.15;
                cout << "Kelvin: " << k << endl;
                break;
            case '4':
                exit(0);
                break;
            default:
                cout << "Ni ma takiej opcji ziomek " << endl;
            }
        }
    case '2':
        //wejscie
        cout << "Dolna granica: ";
      cin >> lower;
      cout << "Gorna granica: ";
      cin >> upper;
      cout << "Krok: ";
      cin >> step;
        // nag³owek
       cout << "==============================\n";
      cout.width(10);
      cout << "Celcius";
      cout.width(10);
      cout << "Kelvin";
      cout.width(10);
      cout << "Farenheit";
      cout << endl << endl;

      for (cel = lower; cel <= upper; cel += step)
      {
          cout.width(10);
           cout << cel;
           cout.width(10);
           k = cel + 273.15;
            cout << k;
            cout.width(10);
            f = 32 + (9/5) * cel;
             cout << f << endl;
      }
      break;

    case '3':
        exit(0);
        break;

    default:
        cout << "Nie ma takiej opcji" << endl;

    }
  getchar();getchar();
    system("cls");
    }
    return 0;
}