# Missing space between consecutive @ [closed]

I noticed today, while experimenting with TeX, a missing space between consecutive @'s :

@ @ @ @
\bye


The dvi output, after interpretation by the TeX program (on the command line on linux) shows : @ @@ @ (there is a missing space between the second and the third @). I observed the same output with pdfTeX but not with latex. Why is that so?

## closed as off-topic by egreg, Stefan Pinnow, Andrew Swann, TeXnician, user36296Apr 16 '17 at 14:02

• This question does not fall within the scope of TeX, LaTeX or related typesetting systems as defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

• I see four equally spaced @ characters after compiling with pdfTeX – user31729 Apr 16 '17 at 12:00
• Checked with tex and dvi2tty: Four equally spaced @ characters! – user31729 Apr 16 '17 at 12:18
• Add the tracing lines that I show in my answer, and then post the log you get from tex, adding to your question in a code section. – David Carlisle Apr 16 '17 at 12:25
• Ok, problem solved, I was sometimes keeping the right alt-key pushed while pressing space, which resulted on an unknown charcacter... Sorry and thank you for your help. – Villetaneuse Apr 16 '17 at 12:25
• I'm voting to close this question as off-topic because the issue was due to erroneous input (unbreakable space and not space) – egreg Apr 16 '17 at 13:20

processed with (pdf)tex the log shows four @ with three equal word spaces

..\hbox(6.94444+0.0)x469.75499, glue set 408.6438fil
...\hbox(0.0+0.0)x20.0
...\tenrm @
...\glue 3.33333 plus 1.66666 minus 1.11111
...\tenrm @
...\glue 3.33333 plus 1.66666 minus 1.11111
...\tenrm @
...\glue 3.33333 plus 1.66666 minus 1.11111
...\tenrm @
...\penalty 10000
...\glue(\parfillskip) 0.0 plus 1.0fil


Tracing enabled via:

\tracingoutput=1

• As I said, in the previous comments, this was due to TeX and pdfTeX making a difference between space and right-Alt + space. Sorry for the inconvenience. – Villetaneuse Apr 16 '17 at 12:28