Round to nearest multiple of a number

Question

Is there an idiomatic way to round to the nearest multiple of a number, short of rounding both up and down and seeing which one is closest?

Assume o

Answer 1

I've answered this before on Rounding off a number to the next nearest multiple of 5

With using cmath::abs

int rounded = n + abs((n % denom) - denom);

You can change denom with any denomination you want