Create a program that asks a user to input a number and then finds the sum of digits of the number using recursion. for example 341 = 3+4+1 = 8

This is what i have but it wont compute anything..

    number = input('Enter a number here:');   

    function result = mySum(numbers)

    numbers = num2str(number) - '0';            

    if length(numbers) == 0                      
        result = 0;

    else
       result = numbers(end) + mySum(numbers(1:end - 1));

    end

    end

Answer 1

[vijaya lakshmi]

Hi Matt,

You have written function definition but missed to call the function 'mySum', that is why it is unable to compute anything.

You can refer to the following code snippet to achieve this

numbers=input('get a number');
    numbers = num2str(numbers);
    out=mySum(numbers)
    function result = mySum(numbers)
     result=0;
    for i=1:length(numbers)
        result=str2double(numbers(end))+mySum(numbers(1:end-1));
    end
    end

Hope this helps you!

Answer 2

[Saptarshi Neogi]

% This program does not require any inbuilt functions.
function x = digit_sum(n)
x=0;
if n>0
    x=mod(n,10)+digit_sum(floor(n./10));%recursive
end

[Diego Sánchez Saldaña]

Very nice and useful answer! thank you so much!