NCERT Computer Science Class #11 – Chapter #6 Solutions – Q #12

Chapter #6 – Flow of Control

Class 11 – Chapter 6 Solutions – PROGRAMMING EXERCISES #7

Write a program to find the sum of digits of an integer number, input by the user.

Python Program:

def sum_of_digits(number):
    # Convert the number to its absolute value to handle negative numbers
    number = abs(number)
    total_sum = 0
    
    while number > 0:
        digit = number % 10  # Get the last digit
        total_sum += digit    # Add it to the total sum
        number //= 10         # Remove the last digit
    
    return total_sum

# Get user input
try:
    user_input = int(input("Enter an integer number: "))
    result = sum_of_digits(user_input)
    print(f"The sum of the digits of {user_input} is: {result}")
except ValueError:
    print("Invalid input. Please enter an integer.")

You can checkout the code from Github here – Programming Exercises – 7

Explanation of the Code:

1.	Function Definition: The sum_of_digits function takes an integer number as 
        input. It uses abs(number) to ensure that it works with negative numbers as 
        well.
2.	Loop: It continues to extract the last digit using number % 10, adds it to 
        total_sum, and then removes the last digit by performing integer division 
        (number //= 10).
3.	User Input: The program prompts the user to enter an integer. It checks if 
        the input is valid.
4.	Output: If valid, it calls the function and prints the calculated sum of 
        digits.

Example Output:

Enter an integer number: 123
The sum of the digits of 123 is: 6

NCERT Computer Science Class 11 Chapter 6 Solutions Q 12