1 #ifdef FOO4 2 four 3 #endif 4 5 6 7 8 #ifdef FOO3 9 three 10 #endif 11 12 13 14 #ifdef FOO2 15 two 16 #endif 17 18 19 #ifdef FOO1 20 one 21 #endif 22 23 #ifdef FOO0 24 zero 25 #endif 26