c# - Why doesn't Math.Round/Floor/Ceiling return long or int?

Question

Every time I use Math.Round/Floor/Ceiling I always cast to int (or perhaps long if necessary). Why exactly do they return double if it's always returning an integer.

Answer 1

The result might not fit into an int (or a long). The range of a double is much greater.

Approximate range of double: ±5.0 × 10^?324 to ±1.7 × 10³⁰⁸

(Source)