# Floating Point Visually Explained

https://fabiensanglard.net/floating_point_visually_explained/index.html

• Window/offset is a more intuitive way to think about IEE754 floating points compared to the usual exponent/mantissa. I tend to agree, and this mental model makes the fact that you lose precision as the whole number portion of the decimal gets bigger abundantly clear.
• The window gets 1 byte, and represents any two consecutive powers of two.
• The offset gets 23 bits, and represents the range of values within the window (and can represent $$2^{23}$$) discrete values.
• To translate a decimal into floating point, find the right window that the whole number portion fits into. Find the offset (one of $$2^{23} = 8388608$$ possibilities) that matches the remainder as closely as possible.
• The “default” IEE754 definition (Mantissa, Exponent, Sign):
$$(-1)^S * 1.M * 2^{(E-127)}$$
• $$\Pi$$ translated to its IEE754 representation, step-by-step:
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