Day 29: Python Program to Reverse of a Number

 

def reverse_a_number(number):

     reversed_a_number = int(str(number)[::-1])

    return reversed_a_number

number = int(input("Enter a number:"))

reversed_a_num = reverse_a_number(number)

print(f"The reverse of {number} is {reversed_a_num}.")

Code Explanation:

1. Function Definition:

def reverse_a_number(number):

This defines a function named reverse_a_number which takes a single parameter, number. The function is designed to reverse this number when called.

2. Reversing the Number:

reversed_a_number = int(str(number)[::-1])

str(number) converts the input number into a string.

[::-1] is a Python slice that reverses the string. This works by starting at the end of the string and moving backwards.

int(...) converts the reversed string back into an integer. This ensures the reversed number is treated as a number and not as a string. If the number has leading zeros after the reversal, they are removed because integer representation doesn't allow leading zeros.

Example:

If number = 123, str(123) becomes '123'. Reversing it with [::-1] gives '321'. Then, int('321') gives the integer 321.

3. Returning the Reversed Number:

return reversed_a_number

The function returns the reversed number.

4. Taking User Input:

number = int(input("Enter a number:"))

This line asks the user to input a number. The input() function reads the user input as a string, and int() is used to convert the input to an integer.

5. Calling the Function:

reversed_a_num = reverse_a_number(number)

Here, the reverse_a_number function is called with the number inputted by the user. The result is stored in the variable reversed_a_num.

6. Printing the Result:

print(f"The reverse of {number} is {reversed_a_num}.")

Finally, the result is printed in a formatted string. This outputs the original number and its reversed version.

#source code --> clcoding.com