https://docs.vultr.com/cpp/sta....ndard-library/cmath/



std::remainder() is a function in C++'s <cmath> library that computes the remainder of division, but unlike % (modulo) or fmod(), it returns the remainder closest to zero.

Syntax:
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double remainder(double x, double y);
float remainder(float x, float y);
long double remainder(long double x, long double y);
x → The dividend (numerator).
y → The divisor (denominator).
Returns → The remainder of x / y, with the result closest to zero