Help with a simple project

Question

I am new to writing in Java. I've been slacking probably more than I should be, and I have a small project that is due on Thursday for my class. Currently, I know how to write in C++ and C++ only. If someone could help me in writing the simple code for my project, that would be great.
The program is simple. It should allow a user to input a string of digits, and then output the sum of those digits.
For example; the user inputs 3563
the program would then output 17 (3+5+6+3)
Thanks for any help.

Answer 1

well, i think I figured out how to do this, except I am having a small error. Here is my code;
public class digitsum {
    public static void main(String[] args)
        throws java.io.IOException {
        int number = 0;
        int sum = 0;
        System.out.println("Enter an integer number: ");
        number = (int) System.in.read();
        System.out.print(+number);
        do
            sum = sum+(number%10);
            number = number/10;
        }while(number>0);
        System.out.print(" The sum is " +sum);
Now when I run the program, it is clear that it is correctly calculating the sum, but for some reason it converts the number which the user inputs into something else.
For example, here is a test run of my program;
Enter an integer number:
56
53 The sum is 8
56 is the number I input, and 53 is the number the program reads. As you can see, it says the sum is 8 (which is correct for 53, but I entered 56).
I am confused.