scc

 1#define M1(x,y) "This is a string $ or # or ## " #x y
 2#define STR "This is a string $ or # or ## and it is ok!"
 3
 4int
 5main(void)
 6{
 7        char *s, *t = M1(and, " it is ok!");
 8
 9	for (s = STR; *s && *s == *t; ++s)
10		++t;
11
12        return *s;
13}