Day 51: Python Program to Form an Integer that has Number of Digits at 10’s LSD at 1’s Place

 def form_integer(number):

    if number < 0:

        print("Please provide a non-negative integer.")

        return None

    num_str = str(number)

    num_digits = len(num_str)

    last_digit = int(num_str[-1])

    result = num_digits * 10 + last_digit

     return result

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

new_integer = form_integer(number)

if new_integer is not None:

    print(f"The newly formed integer is: {new_integer}")

#source code --> clcoding.com 

Code Explanation:

1. Function Definition

def form_integer(number):

Defines a function named form_integer that accepts one parameter, number. This function processes the given number to generate a new integer.

2. Input Validation

if number < 0:

    print("Please provide a non-negative integer.")

    return None

Checks if the input number is negative. If it is, the function:

Prints a message: "Please provide a non-negative integer."

Returns None to terminate the function early and avoid further processing.

3. Convert Number to String

num_str = str(number)

Converts the input number to a string (num_str) so that its digits can be easily accessed and processed.

4. Count Digits

num_digits = len(num_str)

Calculates the total number of digits in the input number using the len() function. The result is stored in num_digits.

5. Extract the Last Digit

last_digit = int(num_str[-1])

Extracts the last digit of the number by accessing the last character of the string (num_str[-1]) and converting it back to an integer.

6. Form New Integer

result = num_digits * 10 + last_digit

Forms a new integer using the formula:

new integer=(number of digits×10)+(last digit)

7. Return Result

return result

Returns the newly formed integer (result) to the caller.

8. Input and Function Call

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

Prompts the user to input a positive integer.

Converts the input to an integer and stores it in the variable number.

new_integer = form_integer(number)

Calls the form_integer function with number as the argument.

Stores the returned value in the variable new_integer.

9. Output the Result

if new_integer is not None:

    print(f"The newly formed integer is: {new_integer}")

Checks if the returned value (new_integer) is not None. If valid:

Prints the newly formed integer.

10. Error Handling

If the user enters a negative number, the program handles it gracefully by displaying a message and skipping further processing.