$3.$ Write an application to take user$$s input as a binary sequence and then convert it to the corresponding hexadecimal format, e$.$g$.,$ the user$$ input is

$100101110$

It should be then converted to $0$x$12$E$.$

Notes:

a$.$ Please do not use other class to conduct the conversion directly other wise no credits for this question.

b$.$ You app should be able to$,$ at least, handle the input with $20$bits.

c$.$ If user$$s input is not binary sequence, i$.$e$.,$ contains other symbols rather than $0$ and $1,$ then your app should complain and ask user to input again.

d$.$ You can decide any other details, e$.$g$.,$ the output format.