## Java: Recursive digit sum function

For an university assignment, I had to implement a **recursive function to calculate the digit sum** of a given number. I place my solution here for my own reference:

```
public static int digitSum(int n) {
if(n < 10)
return n;
else
return n % 10 + digitSum(n / 10);
}
```

This code can also be found in the GitHub repository that I am keeping for university: ChecksumTool.java