System.out.println("Zadanie 1");
        Scanner reader1 = new Scanner(System.in);
        System.out.println("Enter a name: ");
        String n1 = reader1.nextLine();
        System.out.println("Enter a surname: ");
        Scanner reader2 = new Scanner(System.in);
        String n2 = reader2.nextLine();
        System.out.println("Witaj" + n1+ " " + n2);



        System.out.println("Zadanie 2");
        System.out.println("Podaj 10 liczb dodatnich :");
        int i=0;
        int maks=0;
        int min=1000000;
        int suma = 0;
        while(i<10){
            Scanner reader3 = new Scanner(System.in);
            int w = reader3.nextInt();
            maks = max(w,maks);
            min= min(w,min);
            suma+=w;


            i++;
        }
        float srednia = suma/10;
        System.out.println("Suma: "+ suma);
        System.out.println("średnia: "+ srednia);
        System.out.println("Maksimum: "+ maks);
        System.out.println("Minimum: "+  min);



        System.out.println("Zadanie 3");
        System.out.println("Podaj liczbę:");
        Scanner reader4 = new Scanner(System.in);
        float w1 = reader4.nextFloat();
        System.out.println("Podaj znak działania:");
        Scanner reader5 = new Scanner(System.in);
        char w2 =  reader5.next().charAt(0);
        System.out.println("Podaj liczbę:");
        Scanner reader6 = new Scanner(System.in);
        float w3 = reader6.nextFloat();
        switch (w2){
            case '+':
                float suma = w1+w3;
                System.out.println(w1+ "\n"+ w2 + "\n"+ w3 + "\n"+ suma);
                break;
            case '-':
                float roznica = w1-w3;
                System.out.println(w1+ "\n"+ w2 + "\n"+ w3 + "\n"+ roznica);
                break;
            case '*':
                float iloczyn = w1*w3;
                System.out.println(w1+ "\n"+ w2 + "\n"+ w3 + "\n"+ iloczyn);
                break;
            case '/':
                float iloraz = w1/w3;
                System.out.println(w1+ "\n"+ w2 + "\n"+ w3 + "\n"+ iloraz);
                break;