RosettaCodeData/Task/Mertens-function/FutureBasic/mertens-function.basic

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void local fn MertensFunction
long mertens(1000), n, k, crossesTotal = 0, zerosTotal = 0
mertens(1) = 1
for n = 2 to 1000
mertens(n) = 1
for k = 2 to n
mertens(n) = mertens(n) - mertens(n/k)
next
next
printf @"First 99 Mertens numbers:\n \b"
for n = 1 to 99
printf @"%3ld \b", mertens(n)
if ( n mod 10 == 9 ) then print
next
for n = 1 to 1000
if ( mertens(n) == 0 )
zerosTotal++
if mertens(n-1) != 0 then crossesTotal++
end if
next
print
printf @"mertens(n) array is zero %ld times.", zerosTotal
printf @"mertens(n) array crosses zero %ld times.", crossesTotal
end fn
fn MertensFunction
HandleEvents