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program doloop_01
implicit none
integer :: i, j
j = 0
do i = 1, 10
j = j + i
end do
if (j /= 55) error stop
print *, j
j = 0
do i = 10, 1, -1
j = j + i
end do
if (j /= 55) error stop
print *, j
j = 0
do i = 1, 9, 2
j = j + i
end do
if (j /= 25) error stop
print *, j
j = 0
do i = 9, 1, -2
j = j + i
end do
if (j /= 25) error stop
print *, j
j = 0
do i = 1, 10, 2
j = j + i
end do
if (j /= 25) error stop
print *, j
j = 0
do i = 1, 10, 3
j = j + i
end do
if (j /= 22) error stop
print *, j
j = 0
do i = 10, 1, -3
j = j + i
end do
if (j /= 22) error stop
print *, j
j = 0
do i = 1, 1
j = j + i
end do
if (j /= 1) error stop
print *, j
j = 0
do i = 1, 1, -1
j = j + i
end do
if (j /= 1) error stop
print *, j
j = 0
do i = 1, 0
j = j + i
end do
if (j /= 0) error stop
print *, j
j = 0
do i = 0, 1, -1
j = j + i
end do
if (j /= 0) error stop
print *, j
end
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