Nested Macro : Order of Expansion
13,818
It's a consequence of how macros are expanded, and has an impact on self-referential macros... This is quite nicely explained in detail in the GNU CPP manual
Comments
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Amol Sharma almost 2 years
Possible Duplicate:
Why i am not getting the expected output in the following c programme?i am having a doubt in order of evaluation of macros.like for the following code i am not able to understand the ouput:
#include <stdio.h> #define f(a,b) a##b #define g(a) #a #define h(a) g(a) int main() { printf("%s\n",h(f(1,2))); printf("%s\n",g(f(1,2))); return 0; }
Output
12 f(1,2)
why not f is getting expanded first before g in the second printf ?