File: doloop_02.f90

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program doloop_02
    implicit none
    integer :: i, j, a, b
    j = 0
    a = 1
    b = 10
    do i = a, b
        j = j + i
    end do
    if (j /= 55) error stop
    print *, j

    a = 0
    do i = 1, 10
        do j = 1, 10
            a = a + (i-1)*10+j
        end do
    end do
    if (a /= 100*101/2) error stop
    print *, a

    a = 0
    do i = 1, 10
        do j = 1, i
            a = a + j
        end do
    end do
    if (a /= 220) error stop
    print *, a
end