llround
llround follows round half away from zero (not bankers rounding)., and returns long long
1
2
3
4
5
6
7
std::llround(2.3) → 2
std::llround(2.5) → 3
std::llround(2.7) → 3
std::llround(-2.3) → -2
std::llround(-2.5) → -3
std::llround(-2.7) → -3
std::round returns double
1
std::round(2.5); // 3.0 (double)
- Banker’s rounding is to round .5 to the nearest even integer
1
2
3
2.5 2 ← (2 is even),
2.6 → 3
3.5 4 ← (4 is even)
