1 struct X { int i; int j; };
2 #define FOO struct X
3 #define FOO10(x) FOO x ## 0; FOO x ## 1; FOO x ## 2; FOO x ## 3; FOO x ## 4; FOO x ## 5; FOO x ## 6; FOO x ## 7; FOO x ## 8; FOO x ## 9;
4 #define FOO100(x) FOO10(x ## 0) FOO10(x ## 1) FOO10(x ## 2) FOO10(x ## 3) FOO10(x ## 4) FOO10(x ## 5) FOO10(x ## 6) FOO10(x ## 7) FOO10(x ## 8) FOO10(x ## 9)
5   FOO100(x0)
FOO100(x1)6   FOO100(x1)
7   FOO100(x2)
8   FOO100(x3)
9   FOO100(x4)
10   FOO100(x5)
11   FOO100(x6)
12   FOO100(x7)
13   FOO100(x8)
14   FOO100(x9)
15 
16 #define COO(n,f) case n: p = &f; break;
17 #define COO10(n,f) COO(n ## 0, f ## 0) COO(n ## 1, f ## 1) COO(n ## 2, f ## 2) COO(n ## 3, f ## 3) COO(n ## 4, f ## 4) COO(n ## 5, f ## 5) COO(n ## 6, f ## 6) COO(n ## 7, f ## 7) COO(n ## 8, f ## 8) COO(n ## 9, f ## 9)
18 #define COO100(n,f) COO10(n ## 0, f ## 0) COO10(n ## 1, f ## 1) COO10(n ## 2, f ## 2) COO10(n ## 3, f ## 3) COO10(n ## 4, f ## 4) COO10(n ## 5, f ## 5) COO10(n ## 6, f ## 6) COO10(n ## 7, f ## 7) COO10(n ## 8, f ## 8) COO10(n ## 9, f ## 9)
19 
20 int foo(int i)
21 {
22   struct X *p = 0;
23   x000.i = 0;
24   x599.j = 0;
25   switch (i)
26     {
27   COO100(1, x0)
28   COO100(2, x1)
29   COO100(3, x2)
30   COO100(4, x3)
31   COO100(5, x4)
32   COO100(6, x5)
33   COO100(7, x6)
34   COO100(8, x7)
35   COO100(9, x8)
36   COO100(10, x9)
37     }
38   return p->j;
39 }
40