Please find the mistake of the wed program

Question

https://code.sololearn.com/Wy5YGgMV0lby/?ref=app

Answer 1

Your rev variable is not initialized so it takes undefind value so rev*10 is NaN. Assign to default value first rev=0;

In js division is float division operator
So 12/10=>1.2 , not 1 so apply Math.floor(12/10) method. For negetive values use Math.truncate().

No need to apply Number() for all operations. Just apply for input.

For just single comparision, better to use if-else over switch.

Answer 2

Use parseInt() instead of Number() inside while loop.