import math


def i4_bit_lo0(n):
    """
    I4_BIT_LO0 returns the position of the low 0 bit base 2 in an integer.

    Example:
      +------+------------+----
      |    N |     Binary | BIT
      +------+------------+----
      |    0 |          0 |   1
      |    1 |          1 |   2
      |    2 |         10 |   1
      |    3 |         11 |   3
      |    4 |        100 |   1
      |    5 |        101 |   2
      |    6 |        110 |   1
      |    7 |        111 |   4
      |    8 |       1000 |   1
      |    9 |       1001 |   2
      |   10 |       1010 |   1
      |   11 |       1011 |   3
      |   12 |       1100 |   1
      |   13 |       1101 |   2
      |   14 |       1110 |   1
      |   15 |       1111 |   5
      |   16 |      10000 |   1
      |   17 |      10001 |   2
      | 1023 | 1111111111 |   1
      | 1024 | 0000000000 |   1
      | 1025 | 0000000001 |   1

    Parameters:
      Input, integer N, the integer to be measured.
      N should be nonnegative.

      Output, integer BIT, the position of the low 1 bit.
    """
    bit = 0
    i = math.floor(n)
    while (1):
        bit = bit + 1
        i2 = math.floor(i / 2.)
        if (i == 2 * i2):
            break

        i = i2
    return bit