"; echo mittelwert(4, 5) . "
"; echo mittelwert(0.5, 4, 7) . "
"; echo mittelwert(5/2, 7/2, 2, -9) . "

"; echo "Maximum:
"; echo maximum(4, 5) . "
"; echo maximum(0.5, 4, 7) . "
"; echo maximum(5/2, 7/2, 2, -9); ?>