public double calcWoodNeeded(double inputLength, double inputWidth) {

        if (inputLength < 1 || inputLength > 50) { //  length value not within the accepted range?
            return 0;
        }

        if (inputWidth < 1 || inputWidth > 50) { // width value not within the accepted range?
            return 0;
        }

        double woodNeeded = inputWidth * inputLength * 4;

        return woodNeeded;

    }