How can you take input and transfer that into a function to obtain the result of a calculation?

Question

For example:
How do you get the age of an indivual through input and then subtract a predetemined amount from that to obtain a result? Do you require a function?

Answer 1

a=int(input())

func age(a):
b=a-something
return b

print(age(a))

well function makes the code reusable anywhere ,you can achieve it without function as well

a=int(input())
b=a-something
Print(b)

Answer 2

Where is your try . We can help in your problems but dont think that we will provide you code. This is a self learning platform