RosettaCodeData/Task/Primality-by-trial-division/FutureBasic/primality-by-trial-division...

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window 1, @"Primality By Trial Division", (0,0,480,270)
local fn isPrime( n as long ) as Boolean
long i
Boolean result
if n < 2 then result = NO : exit fn
if n = 2 then result = YES : exit fn
if n mod 2 == 0 then result = NO : exit fn
result = YES
for i = 3 to int( n^.5 ) step 2
if n mod i == 0 then result = NO : break
next i
end fn = result
long i, j = 0
print "Prime numbers between 0 and 1000:"
for i = 0 to 1000
if ( fn isPrime(i) != _false )
printf @"%3d\t",i : j++
if j mod 10 == 0 then print
end if
next
HandleEvents