• 2024-10-19sicp每日一题[2.49]
    Exercise2.49Usesegments->paintertodefinethefollowingprimitivepainters:a.Thepainterthatdrawstheoutlineofthedesignatedframe.b.Thepainterthatdrawsan“X”byconnectingoppositecornersoftheframe.c.Thepainterthatdrawsad