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WalterGR
The only examples are in the source.

  [ dup * ] is square
  [ dup 2 < [ drop 1 ] [ dup 1 - fact * ] ifelse ] is fact
  4 square .
  5 fact .
richard_shelton
If you are familiar with Forth, Postscript, or Joy you should have no problems with programming in Fortik :)

Still, the idea of Fortik is to encourage students to learn how simple interpreters work and to extend the language.

WalterGR
Is the first assignment to reverse-engineer the language spec from the interpreter?
richard_shelton
Basically, yes, so I tried to make a simple implementation as possible. And I'm taking into account that students are already familiar with postfix notation and stack data structure. Of course, I use additional sources (like the popular Crafting Interpreters book) in the teaching process.