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Initial data commit

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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 72d218235f
commit f23f22d71c
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Task/M-bius-function/Fortran/m-bius-function.f Normal file
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program moebius
use iso_fortran_env, only: output_unit
integer, parameter :: mu_max=1000000, line_break=20
integer, parameter :: sqroot=int(sqrt(real(mu_max)))
integer :: i, j
integer, dimension(mu_max) :: mu
mu = 1
do i = 2, sqroot
if (mu(i) == 1) then
do j = i, mu_max, i
mu(j) = mu(j) * (-i)
end do
do j = i**2, mu_max, i**2
mu(j) = 0
end do
end if
end do
do i = 2, mu_max
if (mu(i) == i) then
mu(i) = 1
else if (mu(i) == -i) then
mu(i) = -1
else if (mu(i) < 0) then
mu(i) = 1
else if (mu(i) > 0) then
mu(i) = -1
end if
end do
write(output_unit,*) "The first 199 terms of the Möbius sequence are:"
write(output_unit,'(3x)', advance="no") ! Alignment of first number
do i = 1, 199
write(output_unit,'(I2,x)', advance="no") mu(i)
if (modulo(i+1, line_break) == 0) write(output_unit,*)
end do
end program moebius