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Thread: Some Calculators

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    Some Calculators

    Here is an easy tool where you can put the date and get the day of the week:
    Day of the Week Calculator
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    Re: Percentage ?

    Here is a good percentage calculator that will help you do those calculations:
    Percentage Calculator
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    1's & 2's complement calculator

    1ís & 2's complement are methods for representing signed numbers in binary number system.
    They are very important in computer science as we use them today in every computer or smartphone.

    Here is are tools that convert from decimal to 1ís & 2's complement and vice versa:
    1's Complement Calculator
    2's Complement Calculator
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    Re: Some Calculators

    Calculator for checking if a number is a prime number:
    Prime Number Checker
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    Re: Some Calculators

    Quote Originally Posted by gamestoenjoy View Post
    Calculator for checking if a number is a prime number:
    Prime Number Checker
    Why is 9007199254740992 the biggest number you can check?

    -Dan
    Thanks from jonah
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    Re: Some Calculators

    Beer soaked ramblings follow.
    Quote Originally Posted by topsquark View Post
    Why is 9007199254740992 the biggest number you can check?

    -Dan
    Why not?
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    Forum Admin topsquark's Avatar
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    Re: Some Calculators

    Quote Originally Posted by jonah View Post
    Beer soaked ramblings follow.

    Why not?
    It just like a looks like a random cutoff. But I just noticed that it is equal to 20000000000000 in hex. That seems a lot less arbitrary.

    -Dan
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    Re: Some Calculators

    Quote Originally Posted by topsquark View Post
    Why is 9007199254740992 the biggest number you can check?
    It is a the limitation of JavaScript for the biggest integer it can store (this conversion it written in JavaScript).
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    Re: Some Calculators

    Quote Originally Posted by gamestoenjoy View Post
    Here is an easy tool where you can put the date and get the day of the week:
    Day of the Week Calculator
    Which calendars does it handle.

    By the way, Google is pretty good at this too.
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    Re: Some Calculators

    Quote Originally Posted by Archie View Post
    Which calendars does it handle.
    The Gregorian calendar which is the one we use today.
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    Re: Some Calculators

    Gray code is a binary numeral system where two successive values differ in only one bit. It is also known as the reflected binary code.

    Here is an online tool that converts a binary number to gray code number and vise versa:
    Gray Code Converter
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    Re: Some Calculators

    Shannon entropy allows to estimate the average minimum number of bits needed to encode a string of characters based on the alphabet size and the frequency of the characters.

    Use this calculator to calculate it:
    Shannon Entropy Calculator
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    Re: Some Calculators

    Bitwise operations operates on the bit level of a number.
    They may perform faster then operations on the byte level, for example bitwise operations are much faster then equivalent multiplication or division operations.

    Check this calculator here:
    Bitwise Calculator
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    Re: Some Calculators

    Linear Regression is an approach for modeling the straight line relationship between variables by using a linear equation to observed data.
    The linear regression line is represented by the formula Y = A + BX, where X is the explanatory variable and Y is the dependent variable. A is the intercept of the line and B is its slope.

    Here is the calculator:
    Linear Regression Calculator
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    Re: Some Calculators

    Here is a fair random number generator based on the Mersenne Twister algorithm:
    Random number generator
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