# roundToDouble method

double roundToDouble ()

Returns the double integer value closest to `this`.

Rounds away from zero when there is no closest integer: `(3.5).roundToDouble() == 4` and `(-3.5).roundToDouble() == -4`.

If this is already an integer valued double, including `-0.0`, or it is a non-finite double value, the value is returned unmodified.

For the purpose of rounding, `-0.0` is considered to be below `0.0`, and `-0.0` is therefore considered closer to negative numbers than `0.0`. This means that for a value, `d` in the range `-0.5 < d < 0.0`, the result is `-0.0`.

The result is always a double. If this is a numerically large integer, the result may be an infinite double.

## Implementation

    double roundToDouble();