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