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Java Program for Sum the digits of a given number
• Last Updated : 13 Jan, 2018

Given a number, find sum of its digits.

Example :

```Input : n = 687
Output : 21

Input : n = 12
Output : 3
```

1. Iterative:

 `// Java program to compute ``// sum of digits in number.``import` `java.io.*;`` ` `class` `GFG {``     ` `    ``/* Function to get sum of digits */``    ``static` `int` `getSum(``int` `n)``    ``{    ``        ``int` `sum = ``0``;``         ` `        ``while` `(n != ``0``)``        ``{``            ``sum = sum + n % ``10``;``            ``n = n/``10``;``        ``}``     ` `    ``return` `sum;``    ``}`` ` `    ``// Driver program``    ``public` `static` `void` `main(String[] args)``    ``{``        ``int` `n = ``687``;`` ` `        ``System.out.println(getSum(n));``    ``}``}`` ` `// This code is contributed by Gitanjali`

How to compute in single line?

 `// Java program to compute``// sum of digits in number.``import` `java.io.*;`` ` `class` `GFG {``     ` `    ``/* Function to get sum of digits */``    ``static` `int` `getSum(``int` `n)``    ``{``        ``int` `sum;`` ` `        ``/* Single line that calculates sum */``        ``for` `(sum = ``0``; n > ``0``; sum += n % ``10``,``                                  ``n /= ``10``);`` ` `        ``return` `sum;``    ``}`` ` `    ``// Driver code``    ``public` `static` `void` `main(String[] args)``    ``{``        ``int` `n = ``687``;`` ` `        ``System.out.println(getSum(n));``    ``}``}`` ` `// This code is contributed by Gitanjali`

2. Recursive

 `// Java program to compute``// sum of digits in number.``import` `java.io.*;`` ` `class` `GFG {``   ` `    ``/* Function to get sum of digits */` `    ``static` `int` `sumDigits(``int` `no)``    ``{``        ``return` `no == ``0` `? ``0` `: no%``10` `+ ``                  ``sumDigits(no/``10``) ;``    ``}`` ` `    ``// Driver code``    ``public` `static` `void` `main(String[] args)``    ``{``    ``int` `n = ``687``;`` ` `    ``System.out.println(sumDigits(n));``    ``}``}`` ` `// This code is contributed by Gitanjali`

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