#(2^((2^(w-1))-1))*(2-(2^-t))
#(2^((2^(123-1))-1))*(2-(2^-17179869060))
from decimal import *
getcontext().prec = 100
from decimal import localcontext
with localcontext() as ctx:
    print(ctx.Emax) # デフォルトの指数上限は999999なので、今回の計算だと足りない
    ctx.Emax = 10**10**5 # 指数上限を増やす
    #指数部
    w = 123
    #仮数部
    t = 17179869060
    a = ctx.power(2,(w - 1))
    b = ctx.power(2,(a - 1))
    print(b)
    c = t * -1
    d = ctx.power(2,c)
    print(d)
    e = (b * 2 - b * d)
    #最大値
    print(e)
    #必要に応じて有効桁を調整する
    format_str = "{:.1e}".format(e)
    print(format_str)
    f = e.log10()
    #桁数-1
    print(f)
    g = f.log10()
    #桁数の桁数-1
    print(g)
    h = ctx.power(2,t)
    i = h.log10()
    #有効桁数
    print(i)
 

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