On 8/20/2009 11:54 AM, Steve Jaffe wrote:
Why not
if ( 0 ) {
commented with zero
} else {
commented with one
}
Because that doesn't work unless the comments are syntactically correct
R. For example, yours gives:
Error in source("clipboard") : clipboard:2:11: unexpected symbol
1: if ( 0 ) {
2: commented with
^
In C++, you can put nearly arbitrary junk in the #if 0 block, and it
will be stripped by the preprocessor.
Duncan Murdoch
Greg Snow-2 wrote:
I believe that #if lines for C++ programs is handled by the preprocessor,
not the compiler. So if you want the same functionality for R programs,
it would make sense to just preprocess the R file.
In C++, I can use the following construct to choice either of the two
blocks the comment but not both. Depending on whether the number after
"#if" is zero or not, the commented block can be chose. I'm wondering
if such thing is possible in R?
#if 0
commented with 0
#else
commented with 1
#endif
Regards,
Peng
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