WAP to calculate the sum of digits in a number in Java
Logical Steps:
- Take one number.
- Initialize a sum variable to 0 to store the sum of the digits.
-
Use a loop:
-
In each iteration, extract the last digit using
no % 10. - Add the extracted digit to the sum.
-
Remove the last digit by dividing the number by 10 (
no = no/10). - Repeat until the number becomes 0.
-
In each iteration, extract the last digit using
- Print the sum as the result.
Programs:
-
Below is the simple program:
public class SumOfDigits { public static void main(String[] args) { int no = 624; int sum = 0; while (no != 0) { int digit = no % 10; // Extract the last digit sum = sum + digit; // Add the digit to the sum no = no / 10; // Remove the last digit } System.out.println("The sum of the digits is: " + sum); } }Output:
The sum of the digits is: 12
-
Below is the program by taking user input:
import java.util.Scanner; public class SumOfDigits { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter a number: "); int no = scanner.nextInt(); int sum = 0; while (no != 0) { int digit = no % 10; // Extract the last digit sum = sum + digit; // Add the digit to the sum no = no / 10; // Remove the last digit } System.out.println("The sum of the digits is: " + sum); scanner.close(); } }Output:
Enter a number: 1427 The sum of the digits is: 14
Program Explanation
-
Take input from the user using
Scannerand store it in an integer variableno. -
Initialize a variable
sumto 0 to keep track of the sum of the digits. -
Use a
whileloop that runs untilnobecomes 0:-
Extract the last digit using
no % 10.
Example: For 12345, the last digit is 5. -
Add the digit to
sum (sum += digit).
Example: sum = 0 + 5 = 5. -
Remove the last digit from
nousingno = no/10.
Example: 12345 becomes 1234.
-
Extract the last digit using
- Repeat the process until all digits are processed.
-
Print the result, which is the sum of the digits, using
System.out.println(). -
Close the scanner with
scanner.close()to avoid resource leaks.
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