public class Rechner {

    double akku = 0;

    public Rechner() {

    }
    public void plus(double z) {
        akku += z;
    }
    public void minus(double z) {
        akku -= z;
    }
    public void mal(double z) {
        akku *= z;
    }
    public void geteilt(double z) {
        akku /= z;
    }
    public void setAkku(double z) {
        akku = z;
    }
    public double getAkku() {
        return akku;
    }

}