High precision calculator

[1] 2019/05/19 04:08 Male / Under 20 years old / High-school/ University/ Grad student / Useful /

Purpose of use

confirm a high precision division function

[2] 2019/05/09 22:34 Male / 60 years old level or over / An engineer / Very /

Purpose of use

To confirm the results of an extend precision data type with math functions that I am developing (your website is in the credits). Thank you for providing this extremely useful tool free of charge.

Bug report

The answer for a negative value raised to an even power is wrong. For example, -2^2 should be 4, not -4 (just like -2 * (-2), which is correctly calculated as 4). Also, could you please allow copying (so can paste elsewhere) the results in the "Answer" area?

from Keisan

-2^2 = 0 - (2^2) = -4
(-2)^2 = 4
Please refer to the page below.
How to use (6.)

You can copy the result by pressing "Ctrl+C".

[3] 2019/05/04 00:16 Female / 20 years old level / High-school/ University/ Grad student / Very /

Purpose of use

(1+sqrt(5))/2 with better precision than google's calc.

Comment/Request

Worked like magic. Thanks.

[4] 2019/04/30 10:56 Female / Under 20 years old / Elementary school/ Junior high-school student / Very /

Purpose of use

Homework that I obviously can't do without a calculator and other calculators wouldn't fit the whole numbers

[5] 2019/04/25 23:45 Male / Under 20 years old / A homemaker / Very /

Purpose of use

Finding optimal gear ratios for car transmissions

[6] 2019/04/18 04:29 Female / Under 20 years old / Elementary school/ Junior high-school student / Very /

Purpose of use

to get awnsers

Comment/Request

please let us put in word problems

[7] 2019/04/17 22:52 Male / Under 20 years old / Elementary school/ Junior high-school student / Very /

Purpose of use

Finding e^e

Comment/Request

I just noticed inf/inf doesn't equal one and inf/inf2 doesn't equal 1/2. I don't know if there is a mathematical reason for this but it seems simple that x/x=1 and x/xy=1/y.

[8] 2019/04/10 23:42 - / - / - / Very /

Purpose of use

To calculate the 23179945 bit integer

[9] 2019/04/10 18:11 Male / 50 years old level / An engineer / Useful /

Purpose of use

to calculate the chance among N hashes calculated with the sha-256 algorithm are actually the same
N being e.g. 2000000
* 1-prod_f(1,2000000,(((2^256)-x)/(2^256))) didn't work
* had to simulate (as kind of worst case) by: 1-(((2^256)-2000000)/(2^256))^2000000

Comment/Request

prod_f cannot be used with high b value (or high b-a value) as it gives an input error

[10] 2019/03/31 05:57 Male / Under 20 years old / High-school/ University/ Grad student / Very /

Purpose of use

I was trying to find examples of a calculation that was able to overcome the typical accuracy limitations of a normal calculator (due to the usage of floating point calculations) in order to find out how it was done so I can write a program to perform similar calculations.

Comment/Request

Could you give a brief explanation of how you made this program able to output such high precision numbers. Do you simply use a computer that is more than 64 bits or did you write a custom algorithm that can compute the answer in chunks. If so I would love to see an example of the code for these algorithms.

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