Java program to compute the sum of digits in a given numbers

Java program to compute the sum of digits in a given numbers

In this tutorial, we will discuss a concept of  Java program to compute the sum of digits in a given numbers

In the Java programming  language, we can use for loop ,while loop and do-while loop to compute the sum of digits in a given numbers

In this article, we are going to learn  how to find the sum of digits in a given numbers

program to find the sum of digits

Calculate the sum of digits using the for loop

Program 1

import java.util.Scanner;
class SumOfDigits1{
public static void main(String args[]){
    long count,sum=0,digits;
    Scanner scan=new Scanner(System.in);
//create a scanner object for input

//get input from the user for rows
System.out.print("Enter the number for sum: ");
long num=scan.nextInt();
 
count=num;
for(count=num; num>0; num/=10)
{
    digits=num%10;
    sum=sum+digits;
    
}

System.out.print("Given number is: "  + count);
System.out.print("\nSum of the digits: "  + sum);
}
}

When the above code is executed, it produces the following results

Case 1

Enter the number for sum:1100
Given number is: 1100
Sum of the digits:2

Case 2

Enter the number for sum:3456
Given number is: 3456
Sum of the digits:18

 

Calculate the sum of digits using the while loop

Program 2

import java.util.Scanner;
class SumOfDigits{
public static void main(String args[]){
    long count,sum=0,digits;
    Scanner scan=new Scanner(System.in);
//create a scanner object for input

//get input from the user for rows
System.out.print("Enter the number for num: ");
long num=scan.nextInt();
 count=num;

while(num>0)
{
    digits=num%10;
    sum=sum+digits;
    num/=10;
    
}

System.out.print("Given number is: "  + count);
System.out.print("\nSum of the digits: "  + sum);
}
}

When the above code is executed, it produces the following results

case 1

Enter the number:1200
Given number is: 1200
Sum of the digits:3

 

case 2

Enter the number:1468
Given number is: 1468
Sum of the digits:19

 

Calculate the sum of digits using the do-while loop

Program 3

import java.util.Scanner;
class SumOfDigits2{
public static void main(String args[]){
    long count,sum=0,digits;
    Scanner scan=new Scanner(System.in);
//create a scanner object for input

//get input from the user for rows
System.out.print("Enter the number for num: ");
long num=scan.nextInt();
 count=num;
do{
    digits=num%10;
    sum=sum+digits;
    num/=10;
    
}
while(num>0);


System.out.print("Given number is: "  + count);
System.out.print("\nSum of the digits: "  + sum);
}
}

When the above code is executed, it produces the following results

case 1

Enter the number for num: 1111
Given number is:1111
Sum of the digits:4

 

case 2

Enter the number for num: 9876
Given number is:9876
Sum of the digits:30

 

Methods

• Declare the variable num,count and digits as long type.
• Declare and initialize variable sum to Zero.
• Receive input from the user for the value to store the variable num and to find the sum of digits.
• Using a loop (for loop , while loop, do-while loop) get each digit of the number and add it to the to a variable to find the sum.
• Display the sum of the digits of the number.

 

 

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