difask's blog

Done! C++: need help in macros
By difask, 10 years ago, In English

Thanks Gassa for help. The working variant is such:

#define file "taskname"	
#ifdef ONLINE_JUDGE
#define in \
        //file name in task
	freopen(file".in", "r", stdin); \
	freopen(file".out", "w", stdout);
#else
#define in \
        //your file if you use files as input
	freopen("in.txt", "r", stdin);
        //freopen("out.txt", "w", stdout); 
#endif

int main()
{
   in;
}

It will make your code for I/O shorter.

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10 years ago, # |
  Vote: I like it +7 Vote: I do not like it

At least you can do

#ifdef ONLINE_JUDGE
#define OJ \
	freopen(file".in", "r", stdin); \
	freopen(file".out", "w", stdout);
#else
#define OJ ;
#endif
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    »
    10 years ago, # ^ |
      Vote: I like it +1 Vote: I do not like it

    Thanks!!! It's exactly what I wanted!

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