Numbers – Naming Parts of a Whole Number and Fraction

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I'm not sure if I need to ask this in the math site or here. I'm actually a developer and I searched many websites to find out what the whole and fraction part of a number is called in English (naming variables) and I couldn't find it so I thought I might ask it here.

For example the number 4.17, what the integer part(4) and the fraction part(17) are called?

Best Answer

You've already used the correct terminology: integer/integral part and fractional part.

The fractional part or decimal part of a non‐negative real number x {\displaystyle x} x is the excess beyond that number's integer part.

Fractional part - Wikipedia

You also might see noninteger part, as in:

Fractional part

The function frac(x) giving the fractional (noninteger) part of a real number x.

Weisstein, Eric W. "Fractional Part." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/FractionalPart.html

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