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| -rw-r--r-- | forth.html.markdown | 16 |
1 files changed, 4 insertions, 12 deletions
diff --git a/forth.html.markdown b/forth.html.markdown index 7b805057..91591ac9 100644 --- a/forth.html.markdown +++ b/forth.html.markdown @@ -56,17 +56,10 @@ of what is written here should work elsewhere. \ Naturally, as we do so much work with the stack, we'll want some useful methods. -drop \ drop (remove) the item at the top of the stack (note the difference between this and `.`) -dup \ duplicate the item on top the stack -rot \ rotate the top three items (third -> first, first -> second, second -> third) -swap \ swaps the top item with the second item - -\ Examples: - -dup * \ square the top item -2 5 dup * swap / \ half the top item squared -6 4 5 rot * - \ sometimes we just want to reorganize -4 0 drop 2 / \ add 4 and 0, remove 0 and divide the top by 2 +3 dup - \ duplicate the top item (1st now equals 2nd): 3 - 3 +2 5 swap / \ swap the top with the second element: 5 / 2 +6 4 5 rot .s \ rotate the top 3 elements: 4 5 6 ok +4 0 drop 2 / \ remove the top item (dont print to screen): 4 / 2 \ ------------------------------ More Advanced Stack Manipulation ------------------------------ @@ -173,7 +166,6 @@ mynumbers 3 cells erase \ them to 0 we just use `erase`). \ or we can just skip all the above and initialize with specific values: - create mynumbers 64 , 9001 , 1337 , \ the last `,` is important! \ ...which is equivalent to: |