## primes.fth, forth-xlc
primes below 10 : 4 
primes below 100 : 25 
primes below 10000 : 1229 
small primes:
   2   3   5   7  11  13  17  19  23  29
  31  37  41  43  47
sieve(10000), 200 passes: 73050 us per pass
ok

## fib.fth, forth-xlc
fib(20) naive  = 6765 
fib(24) naive  = 46368 
fib(28) iter   = 317811 
fib(24) naive, one run: 320000 us
fib(28) iter, one run:  0 us
ok

## ack.fth, forth-xlc
ack(2,3) = 9 
ack(3,3) = 61 
ack(3,5) = 253 
ack(3,6) = 509 
ack(3,6), one run: 390000 us
ok

## does.fth, forth-xlc
board holds 0..9, sum = 45 
 0 squared is    0
 1 squared is    1
 2 squared is    4
 3 squared is    9
 4 squared is   16
ok

## tests, both builds
PASS hello
PASS does
PASS checks
PASS err-div (rc=2: ERROR: divide by zero)
PASS err-underflow (rc=2: ERROR: stack underflow)
passed 5, failed 0
PASS hello
PASS does
PASS checks
PASS err-div (rc=2: ERROR: divide by zero)
PASS err-underflow (rc=2: ERROR: stack underflow)
passed 5, failed 0