i.4

This code is described in "Computational Geometry in C" (Second Edition), Chapter 8. It is not writ

4
100 10 40 90
0	0
5	5
10	10
15	15
20	20
25	25
30	30
35	35
40	40
45	45
50	50
55	55
60	60
65	65
70	70
75	75
80	80
85	85
90	90
95	95
100	100
105	105
110	110
115	115
120	120
125	125
130	130
135	135
140	140
145	145
150	150