You may never have heard of modular arithmetic, but you use it every day without the slightest difficulty. In this system, numbers wrap around when they reach a certain size called the modulus; it is ...
To multiply a negative number, an arithmetic binary shift moves all the digits in the binary number along to the left and fills the gaps after the shift with 0: to multiply by two, all digits shift ...
One of my fellow contributors here recently wrote a post about leap years and why we have them. This reminded me of modular arithmetic and the formula for calculating the day of the week for any date ...
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