Convertor

package skuska;

import java.util.Scanner;

/**
 *
 * @author Sam
 */
public class Celzius {
    public static void main(String[] args){
    float f;
    float c;
   
    String vstup;
   
    System.out.println("Ak chces prevod z Farenheita na Celzius zadaj f ");
    System.out.println("Ak chces prevod z Celzia na Farenheit zadaj c ");
    System.out.println("Ak chces prevod z Celzia na Kelvina zadaj k ");
   
    Scanner sc = new Scanner(System.in);
    vstup = sc.next();
   
   
    if("f".equals(vstup)) {
   
    Scanner scanner = new Scanner(System.in);
   
   System.out.println("Zadaj stupne farenheita : ");
 
    f = scanner.nextInt();
    c = (5*(f-32)) / 9;
    System.out.println("Stupne celzia su: "+ c);
    }
    if("c".equals(vstup)) {
    float fa;
    float ce;
   
    System.out.println("Zadaj stupne Celzia : ");
   
    Scanner sken = new Scanner(System.in);
    ce = sken.nextInt();
    fa = ((9*ce) / 5) + 32;
    System.out.println("Stupne farenheita su " + fa);
    }
    if("k".equals(vstup)) {
    float kel;
    float cel;
    float kons = (float) 273.15;
     System.out.println("Zadaj stupne Celzia : ");
     Scanner sken = new Scanner(System.in);
    cel = sken.nextInt();
    kel = kons + cel;
    System.out.println("Stupne farenheita su " + kel);
    }
    else {
    System.out.println("Chyba v zadavani!");
    }
    }
   
}