(Split digits) Write a program that prompts the user to enter a four-digit integer and displays the number in reverse order. Here is a sample run:

Question

Enter an integer: 5213

The reversal is

3

2

1

3

Answer 1

def reverse_input(inp):

return int(str(inp)[::-1])

val = input("Enter a four-digit integer: ")

print(reverse_input(val))

Hi,

Please see the attached code and let's look at each step...

(1) we define a function that achieves the task of reversing the input

(2) In this function we first convert the input to a string with str(inp)

(3) Now that it's a string we can iterate through it using list notation.

You may be familiar with something like this my_list[0:10] => this will read the first 10 items in the list named my_list. But there is an implicit "one-at-a-time", so equivalently my_list[0:10:1] and my_list[0:10:2] will read every other item. So by using str(inp)[::-1] we are reading each item in steps of -1 (ie in reverse).

(4) finally we return our result cast as an integer int(str(inp)[::-1])

(5) we ask the user for the input

(6) and we push that input into our function

Hope this makes sense!