Full_Name: Jochen Maydt Version: R2.2.0 OS: Windows Submission from: (NULL) (139.19.34.7) formatC does not handle "single"s correctly: > formatC(as.single(1)) [1] "5.264e-315" attr(,"Csingle") [1] TRUE This seems to be an unlikely use-case, however. Thank you for creating a great programming language, Jochen