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A faster way to calculate the day-of-the-week (www.benjoffe.com)
submitted 2 months ago by to c/programming@programming.dev
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[–] 2 points 2 months ago (5 children)

What does two's complement mean ? I don't want a comp sci definition per se but like language one, how does saying that make sense ?

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  • [–] 9 points 2 months ago (3 children)

    It's how you change a number to/from positive/negative.

    The basic procedure is to represent the number in binary, invert all the bits, add 1.

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  • [–] 3 points 2 months ago (2 children)

    How does that relate to the word "complement"

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  • [–] 17 points 2 months ago* (1 child)

    The same how a complementary color is the "opposite" color on the color circle. You invert all the bits to go around the number space circle (mathematically called a "field"). Opposed to normal number spaces this one is a circle since overflowing a binary number (ie all bits being 1 and adding one) will reset you back to 0.

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