1 #define P(a, b) P1(a,b) 2 #define P1(a,b) a##b 3 4 #define FLT_MIN_EXP (-125) 5 #define DBL_MIN_EXP (-1021) 6 7 #define MIN_EXP P(FLT,_MIN_EXP) 8 9 #define FLT FLT 10 int f1 = MIN_EXP; 11 12 #undef FLT 13 #define FLT DBL 14 int f2 = MIN_EXP; 15