class Kalkulator{
    double x, y, resultat;
    String operator = null;

    public void sett(double z){
        System.out.println("Kalkulator.sett er kalt");
        if (operator == null){
            x = z;
        }
        else {
            y = z;
        }
    }

    public void settX(double x){
        this.x = x;
    }

    public void settY(double y){
        this.y = y;
    }

    public void settOperator(String operator){
        this.operator = operator;
    }

    public void nullstill(){
        x = 0;
        y = 0;
        resultat = 0;
    }

    public void utfoer(){
        double svar = 0.0;
        if (operator.equals("+")){
            svar = x + y;
        }
        else if (operator.equals("-")){
            svar = x - y;
        }
        else if (operator.equals("/")){
            svar = x / y;
        }
        else if (operator.equals("*")){
            svar = x * y;
        }
        else {
            svar = x;
        }
        resultat = svar;
    }
}