Introduction
Calculating the sum of the digits of a number is a common problem in programming. This tutorial will guide you through creating a Python program that takes a number as input and calculates the sum of its digits.
Example:
-
Input:
1234 -
Output:
The sum of the digits is 10 -
Input:
567 -
Output:
The sum of the digits is 18
Problem Statement
Create a Python program that:
- Takes a number as input.
- Calculates the sum of its digits.
- Displays the result.
Solution Steps
- Take Input from the User: Use the
input()function to get a number from the user. - Convert Input to Integer: Convert the input string to an integer.
- Calculate the Sum of Digits: Iterate over each digit, convert it to an integer, and calculate the sum.
- Display the Result: Use the
print()function to display the sum of the digits.
Python Program
# Python Program to Calculate the Sum of Digits
# Author: https://www.rameshfadatare.com/
# Step 1: Take input from the user
num = input("Enter a number: ")
# Step 2: Calculate the sum of digits
sum_of_digits = sum(int(digit) for digit in num if digit.isdigit())
# Step 3: Display the result
print(f"The sum of the digits is {sum_of_digits}")
Explanation
Step 1: Take Input from the User
- The
input()function prompts the user to enter a number. The input is treated as a string to handle each digit separately.
Step 2: Calculate the Sum of Digits
- A generator expression is used within the
sum()function to iterate over each character in the input string. Each character is checked to ensure it is a digit (isdigit()), then converted to an integer, and added to the sum.
Step 3: Display the Result
- The
print()function is used to display the calculated sum of the digits.
Output Example
Example 1:
Enter a number: 1234
The sum of the digits is 10
Example 2:
Enter a number: 567
The sum of the digits is 18
Example 3:
Enter a number: -9876
The sum of the digits is 30
Conclusion
This Python program demonstrates how to calculate the sum of the digits of a number by converting the number to a string and iterating over each character. This example is helpful for beginners to understand loops, string manipulation, and type conversion in Python.