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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`, <https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/-m-i-n_-v-a-l-u-e.html#kotlin.Long.Companion$MIN_VALUE|Long.MIN_VALUE> if it’s less than `Long.MIN_VALUE`, <https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/-m-a-x_-v-a-l-u-e.html#kotlin.Long.Companion$MAX_VALUE|Long.MAX_VALUE> if it’s bigger than `Long.MAX_VALUE`