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I create a new macro

\newcommand\var{test}

I would like to use the macro to compose a string, e.g. as in

\input{the\varfile.txt}

It now looks as if we have a new macro \varfile. How to separate the title of the macro from ordinary text? Is inserting a space the recommended solution as in:

\input{the\var file.txt}

I suppose nothing would be necessary if the variable name was followed by a symbol that cannot make part of a macro name e.g. a dot ..

  • 5
    The short answer is: yes. TeX ignores any space after a control sequence name, so the\var file.txt produces thetestfile.txt. – Phelype Oleinik Jun 12 '18 at 13:54
  • 4
    it's almost the only solution, other ways to terminate a macro when typesttng eg \var{}file would not work here (they would put {} into the file name) – David Carlisle Jun 12 '18 at 14:06

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