Lior Roz :
How do I make a function return the sum of all digits until it becomes a 1 digit number, using recursion? I was able to make a function that gets the sum of all digits, but cant seem to find a way to recursively sum the digits of the sum itself:
class sum_of_digits
{
static int sum_of_digit(int n)
{
if (n == 0)
return 0;
return (n % 10 + sum_of_digit(n / 10));
}
public static void main(String args[])
{
int num = 12345;
int result = sum_of_digit(num);
System.out.println("Sum of digits in " +
num + " is " + result);
}
}
This code prints the sum of '12345', which is 15. But I need to change it so it prints the sum of 1 + 5, which is 6.
cdlane :
do you think it is possible to make it work without an additional method?
Why can't we just let the recursion do the work for us and simply say:
static int sum_of_digit(int n)
{
if (n < 10)
return n;
return sum_of_digit(n % 10 + sum_of_digit(n / 10));
}