Activities/Turtle Art/Tutorials/Stack Programming

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The Forth programming language uses a stack for computations.

On the right of the screen, the Forth words + - x / DUP and SWAP are implemented with blocks.

On the left, a Forth like program to compute 3^2 +4^2 = 25


Screenshot of Turtle Art Activity forth.png

File:Turtle Art Activity forth.ta

What computations can you make with this set of words?

Make additional words with Turtle blocks

The - and / words process the operands on the stack in the reverse order to Forth, you can fix the word definitions on the right with SWAP