When used as an argument to a Print command, Endline inserts an end-of-line delimiter into the printed output.

The actual string printed when Endline is encountered is determined by the language attribute Endline.  As there are several platform-specific conventions for delimiting the end of a line, you may want to explicitly set the value of Endline when defining a language.

LanguageDefinition[Define]("EndlineExample",
   AddPrintHandler(
      Names:-Statement = proc(x)
         Printer:-Print(
            Printer:-Indent(), x, ";", Printer:-Endline()
         )
      end proc
   ),
   SetLanguageAttribute( "Endline" = "\n" ),
   AddFunction( "f", anything::anything, "f" )
);
Translate(f(x), language = "EndlineExample", resultname = t);

t := f(x);