1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
program preprocessor6
! Nested macros
implicit none
#define X 5
#define Y
#ifdef X
# ifdef Y
print *, "1a"
# else
print *, "1b"
# endif
#else
# ifdef Y
print *, "2a"
# else
print *, "2b"
# endif
#endif
#ifdef X
# ifdef Z
print *, "1a"
# else
print *, "1b"
# endif
#else
# ifdef Z
print *, "2a"
# else
print *, "2b"
# endif
#endif
#ifdef Z
# ifdef Y
print *, "1a"
# else
print *, "1b"
# endif
#else
# ifdef Y
print *, "2a"
# else
print *, "2b"
# endif
#endif
#ifdef Z
# ifdef Z
print *, "1a"
# else
print *, "1b"
# endif
#else
# ifdef Z
print *, "2a"
# else
print *, "2b"
# endif
#endif
! ifndef
#ifdef X
# ifndef Y
print *, "1a"
# else
print *, "1b"
# endif
#else
# ifndef Y
print *, "2a"
# else
print *, "2b"
# endif
#endif
! more nesting
#ifdef X
print *, "10"
# ifdef Y
print *, "1a0"
# ifdef Z
print *, "1aa"
# else
print *, "1ab"
# endif
print *, "1ac"
# else
print *, "1b"
# endif
print *, "1c"
#else
print *, "20"
# ifdef Y
print *, "20"
# ifdef Z
print *, "2aa"
# else
print *, "2ab"
# endif
print *, "2a"
# else
print *, "2b"
# endif
print *, "2c"
#endif
#ifdef X
print *, "10"
# ifdef Y
print *, "1a0"
# ifdef X
print *, "1aa"
# else
print *, "1ab"
# endif
print *, "1ac"
# endif
print *, "1c"
#endif
end program
|
