What is this?

Question

Got challenged by SoloLearn and i found this. What the heck is 1e1? And why is that an integer?
https://code.sololearn.com/ckopeF0LL7dg/?ref=app

Answer 1

that is exponent sign.
1e1 => 1*10^1

Answer 2

yes

Answer 3

Ok thx :)

Answer 4

So, the word 'e' is for exponent isn't it Taste ?