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

[Paul Menzel]

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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library(inline)
inc <- "
#include <stdio.h>
"

rw <-cxxfunction(includes=inc, plugin="Rcpp", body="
  unsigned int length = 1;
  printf("%u\\n", length);

  return wrap(length);
")
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