[Rcpp-devel] Using printf: Error in source("/tmp/printf.r") : /tmp/printf.r:8:11: unexpected input

[Romain François]

This has nothing to do with printf, this is simply because you use 
double quotes 'inside' double quotes, replace the outer quotes by single 
quotes and you should be fine.

Please also note that Rprintf is preferred, because it will work on all 
platforms or user interfaces.

Hope this helps,

Romain


Le 18/11/11 20:32, Paul Menzel a écrit :
> Dear Rcpp folks,
>
>
> could you please give me a hint on how to use `printf`.
>
>          library(inline)
>          inc<- "
>          #include<stdio.h>
>          "
>
>          drucken<-cxxfunction(includes=inc, plugin="Rcpp", body="
>            unsigned int length = 1;
>            printf("%u\\n", length);
>
>            return wrap(length);
>          ")
>
> throws the following error, when I try to source it.
>
>          >  source("/tmp/printf.r")
>          Error in source("/tmp/printf.r") : /tmp/printf.r:8:11: unexpected input
>          7:   unsigned int length = 1;
>          8:   printf("%u\\n", length);
>
> Removing the `printf` statement gets rid of the error. I tested the
> standalone example and `gcc` does not complain.
>
>          /* printf example */
>          #include<stdio.h>
>
>          int main()
>          {
>            unsigned int length = 1;
>            printf("%u \n", length);
>
>            return length;
>          }
>
> Probably my mistake is a simple one because
>
>> source("/usr/lib/R/site-library/Rcpp/examples/RcppInline/RcppInlineWithLibsExamples.r")
> works and `printf` statements are used in there. (I had to install
> `libgsl0-dev` to get the headers.)
>
>
> Thanks,
>
> Paul
>
>
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-- 
Romain Francois
Professional R Enthusiast
http://romainfrancois.blog.free.fr

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