On 12/31/2011 4:44 AM, R A wrote: > > alright, here's another example why eval is a good idea: > > #define A 17 > #define B 153 > #define N1 ((A + B)/2) /* intended was (17 + 153)/2 */ > > #undef A > #define A 230 > #define N2 ((A + B)/2) /* intended was (230 + 153)/2 */ Bad example, this is a misuse of the preprocessor in any case!