while converting the Double value to Long, is type overflow possible?

yes.

1e19.toLong()

gets truncated to

Long.MAX_VALUE

Truncation is not overflow but i got the point thank u. The fractional part, if any, is rounded down towards zero. Returns zero if this

Double

value is

NaN

, Long.MIN_VALUE if it’s less than

Long.MIN_VALUE

, Long.MAX_VALUE if it’s bigger than

Long.MAX_VALUE