Add example programs and test suite for North Forth#23
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Adds five example programs under examples/ demonstrating key language capabilities, with a corresponding test suite (tests/test-examples.sh, make test-examples). - fibonacci.fs iterative fib(n) using two VARIABLE cells - ackermann.fs recursive Ackermann-Péter via RECURSE - sieve.fs Sieve of Eratosthenes with HERE/ALLOT array - charclass.fs isdigit/isupper/islower/isalpha/isalnum/isspace/toupper/tolower - wordcount.fs count-words with pre-stored demo strings (no S" quoting needed) Each .fs file is stripped of \ comments and embedded in a Hoon tape literal, following the same pattern as tests/test-nock.sh. Boolean results are normalised with "1 AND" so tests compare ~[1]/~[0]. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
North's DO LOOP (like ANS Forth) always executes the body at least once, so '0 0 DO ... LOOP' iterated once rather than zero times. For fib(2), '2 - 0 DO' became '0 0 DO' causing fib(2)=2 instead of 1. Replaced with a counted BEGIN/WHILE/REPEAT loop that correctly iterates zero times when n=2. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Adds five example programs under examples/ demonstrating key language capabilities, with a corresponding test suite (tests/test-examples.sh, make test-examples).
Each .fs file is stripped of \ comments and embedded in a Hoon tape literal, following the same pattern as tests/test-nock.sh. Boolean results are normalised with "1 AND" so tests compare
[1]/[0].