1 #define x y 2 #define x z 3 4 #define abc 123 5 #define abc() 123 6 7 #define foo() bar 8 #define foo(x) bar 9 10 #define bar() baz 11 #define bar baz 12 13 #define biff(a,b) a+b 14 #define biff(a,b,c) a+b 15 16 #define oper(a,b) a+b 17 #define oper(a,b) a*b 18