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toml_12953 · (This post was last modified: 11-12-2019 08:32 PM by toml_12953.)

Here's a Python program modeled after the Decimal BASIC version but it doesn't have extended precision. I'm new to Python and don't know how to get the most out of it.

Code:

def log_2():

    import math,time

    nd=int(input("Number of decimal places: "))

    t = time.time()

    k = math.ceil(nd/math.log(8))

    n = k*k

    m = 2*k - 1

    c = 8

    d0 = c*(k - 2) + 10

    d1 = 2*k*(2*k - 1)

    d2 = 4*k + 1

    s1 = 0

    s2 = 0

    for i in range(1,k+1):

        s1 = s1 + 1/d1

        d1 = d1 - d0

        d0 = d0 - c

        s2 = n/(s2 + d2)

        n = n - m

        m = m - 2

    s2 = 1/(s2 + d2)

    r = time.time() - t

    rs = str(s1 + s2)

    print()

    print(" ",end="")

    print(rs[0:2],end="")

    for i in range(2,nd+2):

        print(rs[i:i+1],end="")

        if (i - 1) % 10 == 0:

            print(" ",end="")

        if (i - 1) % 50 == 0:

            print()

            print(" ",end="")

    if (i - 2) % 50 != 0 or nd == 0:

        print()

    print()

    print("Runtime: ",end="")

    print('%4.2f' %r ,end="")

    print(" seconds")