Program design – simple basic structures?

Do you mean something like this:

 +------------------------+ | Eingabe: "Note", A | | Eingabe: "Note", B | | Eingabe: "Note", W | +-----------+------------+ | +--------------+---------------+ | Durchschnitt = (A + B + W)/3 | +--------------+---------------+ | +----------+------------+ / Durchschnitt > 4,49 \_ ja__ "Nicht bestanden" \_________________________/ |nein | +----------+------------+ / Note A > 4 \_ ja__ "Nicht bestanden" \_________________________/ |nein "bestanden"