Sum Of Digits | Write a program in Java to print the sum of digits of a number. | ISC Computer Science | ICSE Computer Application

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Algorithm

  1.   Start
  2. in:=0
  3. temp:=0
  4. digit:=0
  5. sum:=0
  6. Print "Enter a number"
  7. Read n
  8. temp=in
  9. sum=0
  10. If temp>0, go to step 11 or else go to step 11 or else go to step 15
  11. digit=temp%10
  12. sum=sum+digit
  13. temp=temp/10
  14. Go to step 10
  15. Print "The sum of digits of "+in+" is "+sum
  16. Stop

Program

BufferedReader

import java.io.*;
class DigiSum
{
    int in, temp, digit, sum;
    void accept() throws IOException
    {
        BufferedReader br=new BufferedReader (new InputStreamReader (System.in));
        System.out.println("Enter a number");
        in=Integer.parseInt(br.readLine());
    }
    
    void sumOfDigits()
    {
        temp=in;
        sum=0;
        while(temp>0)
        {
            digit=temp%10;
            sum=sum+digit;
            temp=temp/10;
        }
    }
    
    void display()
    {
        System.out.println("The sum of digits of "+in+" is "+sum);
    }
    
    void main() throws IOException
    {
        accept();
        sumOfDigits();
        display();
    }
}

Scanner

import java.util.*;
class DigiSum
{
    int in, temp, digit, sum;
    void accept()
    {
        Scanner sc=new Scanner (System.in);
        System.out.println("Enter a number");
        in=sc.nextInt();
    }
    
    void sumOfDigits()
    {
        temp=in;
        sum=0;
        while(temp>0)
        {
            digit=temp%10;
            sum=sum+digit;
            temp=temp/10;
        }
    }
    
    void display()
    {
        System.out.println("The sum of digits of "+in+" is "+sum);
    }
    
    void main()
    {
        accept();
        sumOfDigits();
        display();
    }
}

Documentation

Variable Description

 Data TypeVariable NameDescription
 intin To store the number accepted by the user 
 inttemp To act as a temp variable 
 intdigit To store the digit of the number 
 intsum To store the sum of digits of a number 

Method Description

Return Type Method NameDescription
 voidaccept() To accept data from the user 
 voidsumOfDigits() To calculate the sum of digits of a number 
 voiddisplay() To display the sum of digits 
 voidmain() To act as an entry gateway for the compiler 

Output

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