What is the use of manually raising exceptions?

Answer 1

Any examples?

Answer 2

Where have you specified that it fails only for the case you mentioned

Answer 3

this code isn't working

Answer 4

When I enter an integer, it doesn't show me an error.

Answer 5

And you have used .fail() in the if statement and you are telling that if it executes then the input is not a double but when it fails doesn't it mean that it failed to receive the input itself. So, how can you tell that it isn't a double.

Answer 6

Ok

Answer 7

Tq for the help