Can someone explain to me why this doesn't work or breaks during compiled time.
Code:#define now_inc ( x ) ++(x); now_loop ( (x) ) #define now_dec ( x ) --(x); now_loop ( (x) ) #define now_loop( x ) (x) < 5 ? now_inc( (x) ) : now_dec( (x) ) int main( void ) { int i = 0; now_loop( i ) printf("%d", i ); return 0; }
You're missing a semicolon somewhere.
Kurt
Perhaps you need a different hobby.
Trying to rewrite the language using the C pre-processor is one of those way off esoteric things that you never see in practice.Code:$ gcc -E foo.c # 1 "foo.c" # 1 "<built-in>" # 1 "<command-line>" # 1 "foo.c" int main( void ) { int i = 0; (i) < 5 ? ( x ) ++(x); now_loop ( (x) )( (i) ) : ( x ) --(x); now_loop ( (x) )( (i) ) printf("%d", i ); return 0; }
FWIW, you have a recursive expansion.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
not sure if you're being rude or sarcastic, but I wasn't looking for any practical use for this attempt. I did look up that compilers just replaces x with whatever value, but not sure why i didn't replace x through the entire recursion. Actually, I did have a purpose. I know you can do recursive templates, and I wanted to see if there was a C-equivalent to doing a loop during compilation or prior. I guess not.
Last edited by Darkinyuasha1; 04-05-2013 at 01:53 PM.
