I have seen in many codes that structure like following is using :
#ifdef something
...
#endif
Where can I set up "something"? I use CodeBlocks. Thank you!
# | User | Rating |
---|---|---|
1 | tourist | 4009 |
2 | jiangly | 3831 |
3 | Radewoosh | 3646 |
4 | jqdai0815 | 3620 |
4 | Benq | 3620 |
6 | orzdevinwang | 3529 |
7 | ecnerwala | 3446 |
8 | Um_nik | 3396 |
9 | gamegame | 3386 |
10 | ksun48 | 3373 |
# | User | Contrib. |
---|---|---|
1 | cry | 164 |
1 | maomao90 | 164 |
3 | Um_nik | 163 |
4 | atcoder_official | 160 |
5 | -is-this-fft- | 158 |
6 | awoo | 157 |
7 | adamant | 156 |
8 | TheScrasse | 154 |
8 | nor | 154 |
10 | Dominater069 | 153 |
I have seen in many codes that structure like following is using :
#ifdef something
...
#endif
Where can I set up "something"? I use CodeBlocks. Thank you!
Name |
---|
This can be done in the compiler settings of your IDE. Usually they allow you to pass some arguments to the compiler invocation. You need to pass the argument:
-D something
you could enable by putting #define something 1 before that #ifdef :
This is a simple example for
#ifdef
,#ifndef
and#else
you can also have#elif
which works likeelse if
and there is#if
that works likeif
;For Codeblocks: Settings -> Compiler.
If you invoke gcc manually:
g++ -DSOMETHING ...